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Some JavaScript exercises solved by me

From CodeWars

exercise: https://www.codewars.com/kata/55f9bca8ecaa9eac7100004a/train/javascript

function past(h, m, s){
  return h * 3600000 + m * 60000 + s * 1000;
}

exercise: https://www.codewars.com/kata/56676e8fabd2d1ff3000000c

let hayst = ["hay", "junk", "hay", "hay", "moreJunk", "needle", "randomJunk"];
function findNeedle(haystack) {
  return `found the needle at position ${haystack.findIndex((word) => {return word == "needle"})}`;
}

exercise: https://www.codewars.com/kata/57a429e253ba3381850000fb/train/javascript

function bmi(weight, height) {
  let x = weight / Math.pow(height, 2);
  switch (true){
    case x <= 18.5: return "Underweight";
    case x <= 25.0: return "Normal";
    case x <= 30.0: return "Overweight";
    case x > 30: return "Obese";
  }

exercise: https://www.codewars.com/kata/53369039d7ab3ac506000467/train/javascript

function boolToWord( bool ){
  if (bool == true){return 'Yes'};
  if (bool == false){return 'No'};
}

exercise: https://www.codewars.com/kata/5769b3802ae6f8e4890009d2/train/javascript

function removeEveryOther(arr){
  for (let i=1; i<arr.length; i++){
    arr.splice(i, 1);
  }
  return arr;
}

exercise: https://www.codewars.com/kata/53ee5429ba190077850011d4/train/javascript

function doubleInteger(i) {
  i = i * 2;
  return i;
}

exercise: https://www.codewars.com/kata/5772da22b89313a4d50012f7/javascript

function greet(name, owner) {
  if (name == owner){return 'Hello boss';}
  else {return 'Hello guest';}
}

exercise: https://www.codewars.com/kata/55cb632c1a5d7b3ad0000145/train/javascript

function hoopCount(n) {
  if (n >= 10) {return "Great, now move on to tricks"} else {return "Keep at it until you get it"};
}

exercise: https://www.codewars.com/kata/57a0556c7cb1f31ab3000ad7/train/javascript

function makeUpperCase(str) {
  return str.toUpperCase();
}

exercise: https://www.codewars.com/kata/555086d53eac039a2a000083/train/javascript

function lovefunc(flower1, flower2){
 if (flower1 % 2 == 0 && flower2 % 2 == 0){
  return false;
 } else if (flower1 % 2 == 1 && flower2 % 2 == 0){
  return true;
 } else if (flower1 % 2 == 1 && flower2 % 2 == 1){
  return false;
 } else if (flower1 % 2 == 0 && flower2 % 2 == 1){
  return true;
 }
}

exercise: https://www.codewars.com/kata/56b1f01c247c01db92000076/javascript

function doubleChar(str) {
  return str.split("").map(c => c + c).join("");
}

exercise: https://www.codewars.com/kata/57a0885cbb9944e24c00008e/train/javascript

function removeExclamationMarks(s) {
  let result = "";
  for (let i = 0; i < s.length; i++) {
    if (s[i] == '!'){result = result + ""}
    else {result = result + s[i]}
  }
  return result;
}

exercise: https://www.codewars.com/kata/5966e33c4e686b508700002d/javascript

function sumStr(a,b) {
  return String(Number(a)+Number(b));
}

exercise: https://www.codewars.com/kata/5ad0d8356165e63c140014d4/train/javascript

function finalGrade (exam, projects) {
  if (exam > 90 || projects > 10){return 100}
  else if (exam > 75 && projects >= 5){return 90}
  else if (exam > 50 && projects >= 2){return 75}
  else {return 0};
}

exercise: https://www.codewars.com/kata/5265326f5fda8eb1160004c8/train/javascript

function numberToString(num) {
  return String(num);
}

exercise: https://www.codewars.com/kata/53dbd5315a3c69eed20002dd/train/javascript

function filter_list(l) {
  let l2 = [];
  for (let i=0; i<l.length;i++){
    if (typeof l[i] == 'number'){
      // l.splice(i, 1);
      l2.push(l[i]);
    }
  };
  return l2;
}
/* alternative
function filter_list(l) {
  return l.filter(function(v) {return typeof v == 'number'})
}
*/

exercise: https://www.codewars.com/kata/5ab6538b379d20ad880000ab/train/javascript

const areaOrPerimeter = function(l , w) {
  if (l == w){return Math.pow(l, 2);}
  else {return 2*l+2*w;};
};
/* alternative
const areaOrPerimeter = function(l , w) {
  return l == w ? l*w : 2*(l + w)
};*/

exercise: https://www.codewars.com/kata/5b853229cfde412a470000d0/train/javascript

function twiceAsOld(dadYearsOld, sonYearsOld) {
  if (dadYearsOld == 2*sonYearsOld){return 0;}
  else {return dadYearsOld > 2*sonYearsOld ? dadYearsOld-2*sonYearsOld : 2*sonYearsOld-dadYearsOld};
}
/* alternative
function twiceAsOld(dadYearsOld, sonYearsOld) {
  return Math.abs(dadYearsOld - 2 * sonYearsOld);
}*/

exercise: https://www.codewars.com/kata/53dc23c68a0c93699800041d/train/javascript

function smash(words) {
   return words.join(' ');
};

exercise: https://www.codewars.com/kata/5672a98bdbdd995fad00000f/javascript

const rps = (p1, p2) => {
  if (p1=='paper' && p2=='scissors'){return 'Player 2 won!';}
  else if (p1=='paper' && p2=='rock'){return 'Player 1 won!';}
  else if (p1=='paper' && p2=='paper'){return 'Draw!';}
  else if (p1=='rock' && p2=='paper'){return 'Player 2 won!';}
  else if (p1=='rock' && p2=='scissors'){return 'Player 1 won!';}
  else if (p1=='rock' && p2=='rock'){return 'Draw!';}
  else if (p1=='scissors' && p2=='rock'){return 'Player 2 won!';}
  else if (p1=='scissors' && p2=='paper'){return 'Player 1 won!';}
  else if (p1=='scissors' && p2=='scissors'){return 'Draw!';}
};

exercise: https://www.codewars.com/kata/57356c55867b9b7a60000bd7/train/javascript

function basicOp(operation, value1, value2){
  return eval(value1 + operation + value2);
}

exercise: https://www.codewars.com/kata/582cb0224e56e068d800003c/train/javascript

function litres(time) {
  return Math.floor(time * 0.5);
}

exercise: https://www.codewars.com/kata/54c27a33fb7da0db0100040e/train/javascript

var isSquare = function(n){
   return Number.isInteger(Math.sqrt(n));
}

exercise: https://www.codewars.com/kata/5502c9e7b3216ec63c0001aa/javascript

function openOrSenior(data){
  return data.map(x => x[0]>=55 && x[1]>7 ? "Senior" : "Open");
  /* alternative:
  let outp = [];
  for (let i=0; i<data.length; i++){
    if (data[i][0]>=55 && data[i][1]>7){
      outp = outp.push("Senior");
    } else {outp = outp.push("Open");};
  }
  return outp;
  */
}

exercise: https://www.codewars.com/kata/5513795bd3fafb56c200049e/javascript

function countBy(x, n) {
  let z = [];
  for (let i=1;i<=n;i++){z.push(x*i)};
  return z;
}

exercise: https://www.codewars.com/kata/56747fd5cb988479af000028/train/javascript

function getMiddle(s){
  s = s.split("");
  if (s.length % 2 == 0){
    return s[s.length/2 - 1] + s[s.length/2];
  } else {return s[(s.length + 1)/2 -1];};
}

exercise: https://www.codewars.com/kata/551b4501ac0447318f0009cd/train/javascript

function booleanToString(b){
  return String(b);
}

exercise: https://www.codewars.com/kata/55d24f55d7dd296eb9000030/javascript

var summation = function (num) {
  return num*(1+num)/2
}

exercise: https://www.codewars.com/kata/52fba66badcd10859f00097e/train/javascript

function disemvowel(str) {
  return str.replace(/[aeiou]/ig,'');
};

exercise: https://www.codewars.com/kata/542c0f198e077084c0000c2e/javascript

function getDivisorsCnt(n){
  let arr01 = [];
  for (let i=0; i<=n; i++){
    if (n%i == 0){
      arr01.push(i);
    };
  };
  return arr01.length;
};

exercise: https://www.codewars.com/kata/57a083a57cb1f31db7000028/javascript

function powersOfTwo(n){
  let ar01 = [];
  for (let i=0; i<=n; i++){
    ar01.push(Math.pow(2, i));
  };
  return ar01;
};

exercise: https://www.codewars.com/kata/523b623152af8a30c6000027/train/javascript

function square(i){return Math.pow(i, 2)};

exercise: https://www.codewars.com/kata/51f2b4448cadf20ed0000386/javascript

function removeUrlAnchor(url){
  return url.split('#')[0];
}

exercise: https://www.codewars.com/kata/558fc85d8fd1938afb000014/javascript

function sumTwoSmallestNumbers(numbers) {  
  return numbers.sort((a, b) => a-b)[0] + numbers.sort((a, b) => a-b)[1];
}

exercise: https://www.codewars.com/kata/529eef7a9194e0cbc1000255/train/javascript

var isAnagram = function(test, original) {
  return original.toLowerCase().split('').sort().join('') == test.toLowerCase().split('').sort().join('')?true:false;
};

exercise: https://www.codewars.com/kata/57a1fd2ce298a731b20006a4/train/javascript

function isPalindrome(x) {
  return x.toLowerCase() == x.toLowerCase().split('').reverse().join('')?true:false;
}

exercise: https://www.codewars.com/kata/5547929140907378f9000039/train/javascript

function shortcut (string) {
  return string.replace(/[aeiou]/gi,'');
}

exercise: https://www.codewars.com/kata/568dcc3c7f12767a62000038/train/javascript

function setAlarm(employed, vacation){
  return (employed == true && vacation == false) ? true : false;
}

exercise: https://www.codewars.com/kata/59441520102eaa25260000bf/javascript

function unusualFive() {
  return 'funny'.length;
}

exercise: https://www.codewars.com/kata/57ea5b0b75ae11d1e800006c/train/javascript

function sortByLength (arr) {
  return arr.sort((a, b) => a.length - b.length);
};

exercise: https://www.codewars.com/kata/55908aad6620c066bc00002a/javascript

  let ar1 = str.split('').filter(word => word.match(/[x]/ig)).length;
  let ar2 = str.split('').filter(word => word.match(/[o]/ig)).length;
  return ar1 == ar2?true:false;
}

exercise: https://www.codewars.com/kata/578553c3a1b8d5c40300037c/train/javascript

function binaryArrayToNumber(arr02) {
  arr02 = arr02.reverse();
  let result = 0;
  for (let i=0; i<=arr02.length; i++){
    if(arr02[i] == 1){result = result + Math.pow(2, i)}
  }
  // return arr02.reverse().map(x => Math.pow(x, arr02));
  return result;
};

exercise: https://www.codewars.com/kata/55fab1ffda3e2e44f00000c6/javascript

function cockroachSpeed(s) {
  return Math.floor(s*1000*100/3600);
}

exercise: https://www.codewars.com/kata/576bb71bbbcf0951d5000044/javascript

function countPositivesSumNegatives(input) {
return input && input.length ? [input.filter(a => a>0).length, input.filter(b => b<0).reduce((c,d) => c+d, 0)] : [];
}

exercise: https://www.codewars.com/kata/5949481f86420f59480000e7/train/javascript

function oddOrEven(array) {
  return (array.reduce((a, b) => a+b, 0) % 2 == 0) ? "even": "odd";
}

exercise: https://www.codewars.com/kata/57eae20f5500ad98e50002c5/javascript

function noSpace(x){
return x.replace(/\s/g, '');
}

exercise: https://www.codewars.com/kata/54e6533c92449cc251001667/train/javascript

function uniqueInOrder(iterable){
  return Array.from(iterable).filter((a, b) => a != Array.from(iterable)[b+1]);
}

exercise: https://www.codewars.com/kata/563a631f7cbbc236cf0000c2/train/javascript

function move (position, roll) {
  return position + roll*2;
}

exercise: https://www.codewars.com/kata/55d1d6d5955ec6365400006d/javascript

function roundToNext5(n){
  return n % 5 == 0 ? n : Math.ceil(n/5)*5;
}

exercise: https://www.codewars.com/kata/577a98a6ae28071780000989/train/javascript

function min(list){
    return list.sort((a,b) => a-b)[0];
};
function max(list){
    return list.sort((a,b) => b-a)[0];
};

exercise: https://www.codewars.com/kata/577bd026df78c19bca0002c0/train/javascript

function correct(string){
	return string.replace(/0/g, "O").replace(/5/g, "S").replace(/1/g, "I");
};

exercise: https://www.codewars.com/kata/58cb43f4256836ed95000f97/train/javascript

function findDifference(a, b) {
  return a[0]*a[1]*a[2] > b[0]*b[1]*b[2]?a[0]*a[1]*a[2] - b[0]*b[1]*b[2]:b[0]*b[1]*b[2] - a[0]*a[1]*a[2];
};

exercise: https://www.codewars.com/kata/559ac78160f0be07c200005a/train/javascript

function nameShuffler(str){
  return str.split(' ')[1] + ' ' + str.split(' ')[0];
};

exercise: https://www.codewars.com/kata/55ad04714f0b468e8200001c/javascript

function getChar(c){
  return String.fromCharCode(c);
};

exercise: https://www.codewars.com/kata/57a4d500e298a7952100035d/train/javascript

function hexToDec(hexString){
  return parseInt(hexString, 16);
};

exercise: https://www.codewars.com/kata/5b077ebdaf15be5c7f000077/train/javascript

var countSheep = function (num){
  let str01 = "";
  for (let i=1; i<=num; i++){str01 = str01 + i + " sheep..."}
  return str01;
};

exercise: https://www.codewars.com/kata/57a55c8b72292d057b000594/train/javascript

function reverse(string){
  return string.split(' ').reverse().join(' ');
};

exercise: https://www.codewars.com/kata/57fb09ef2b5314a8a90001ed/javascript

function replace(s){
  return s.replace(/[aeiouAEIOU]/g, "!");
};

exercise: https://www.codewars.com/kata/55b42574ff091733d900002f/javascript

function friend(friends){
  return friends.filter(x => x.length == 4);
};

exercise: https://www.codewars.com/kata/52f3149496de55aded000410/train/javascript

function sumDigits(number) {
  return Math.abs(number).toString().split('').reduce((a, b) => Number(a) + Number(b), 0);
};

exercise: https://www.codewars.com/kata/568d0dd208ee69389d000016/train/javascript

function rentalCarCost(d) {
  return d>=3 ? (d>=7 ? d*40-50 : d*40-20) : d*40;
};

exercise: https://www.codewars.com/kata/576757b1df89ecf5bd00073b/javascript

function towerBuilder(nFloors) {
  return Array.from({length: nFloors}, (a, b) => {return ' '.repeat(nFloors - b - 1) + '*'.repeat(b + b + 1) + ' '.repeat(nFloors - b - 1);});
};

exercise: https://www.codewars.com/kata/58b8c94b7df3f116eb00005b/javascript

function reverseLetter(str) {
  return [...str].reverse().filter(x => x.match(/[a-z]/ig)).join(''); 
}

exercise: https://www.codewars.com/kata/54ff0d1f355cfd20e60001fc/javascript

function factorial(n){
  if (n < 0 || n > 12)
    throw new RangeError();
  return n <= 1 ? 1 : n * factorial(n - 1);
};

exercise: https://www.codewars.com/kata/559590633066759614000063/javascript

function minMax(arr){
  return [Math.min(...arr), Math.max(...arr)];
};

exercise: https://www.codewars.com/kata/554b4ac871d6813a03000035/javascript

function highAndLow(numbers){
  return String(Math.max(...numbers.split(' ')) + ' ' + Math.min(...numbers.split(' ')));
};

exercise: https://www.codewars.com/kata/54ff3102c1bad923760001f3/javascript

function getCount(str) {
  return str.match(/[aeiou]/g) == null ? 0 : str.match(/[aeiou]/g).length;
};

exercise: https://www.codewars.com/kata/546e2562b03326a88e000020

function squareDigits(num){
  return Number(String(num).split('').map(x => x**2).join(''));
}

exercise: https://www.codewars.com/kata/5467e4d82edf8bbf40000155

function descendingOrder(n){
  return Number(String(n).split('').sort((a,b) => b-a).join(''));
}

exercise: https://www.codewars.com/kata/5667e8f4e3f572a8f2000039

function accum(s) {
  return s.split('').map((c, i) => (c.toUpperCase() + c.toLowerCase().repeat(i))).join('-');
}

exercise: https://www.codewars.com/kata/54ba84be607a92aa900000f1/train/javascript

function isIsogram(str){
  return new Set(str.toLowerCase()).size == str.length;
};

exercise: https://www.codewars.com/kata/55f2b110f61eb01779000053/javascript

function getSum(a, b){
  return (Math.min(a,b)+Math.max(a,b))/2 * (Math.max(a,b) - Math.min(a,b) + 1);
};

exercise: https://www.codewars.com/kata/56269eb78ad2e4ced1000013

function findNextSquare(sq) {
  return Number.isInteger(Math.sqrt(sq)) == true ? Math.pow(Math.sqrt(sq) + 1, 2) : -1;
};

exercise: https://www.codewars.com/kata/551f37452ff852b7bd000139

function addBinary(a,b) {
  return (a+b).toString(2);
};

exercise: https://www.codewars.com/kata/56606694ec01347ce800001b

function isTriangle(a,b,c){
   return (a+b)>c?(b+c)>a?(a+c)>b?true:false:false:false;
}

exercise: https://www.codewars.com/kata/55fd2d567d94ac3bc9000064

function rowSumOddNumbers(n) {
  return Math.pow(n, 3);
};

exercise: https://www.codewars.com/kata/51f2d1cafc9c0f745c00037d

function solution(str, ending){
  return new RegExp(ending + "$").test(str);
}

exercise: https://www.codewars.com/kata/5259b20d6021e9e14c0010d4

function reverseWords(str) {
  return str.split(' ').map(x => x.split("").reverse().join("")).join(" ");
}

exercise: https://www.codewars.com/kata/554e4a2f232cdd87d9000038

function DNAStrand(dna){
  return [...dna].map(x => x == "A" ? "T" : x == "T" ? "A" : x == "C" ? "G" : x == "G" ? "C" : "?").join('');
};

exercise: https://www.codewars.com/kata/5813d19765d81c592200001a

function dontGiveMeFive(start, end){
  return new Array(end - start + 1).fill().map((_, i) => start + i).filter(x => !/5/.test(String(x))).length;
};

exercise: https://www.codewars.com/kata/534ea96ebb17181947000ada

function breakChocolate(n,m) {
  return n<1 || m<1 ? 0 : (n-1) + n * (m-1);
}

exercise: https://www.codewars.com/kata/5412509bd436bd33920011bc

function maskify(cc) {
  cc = cc.toString().split('');
  if (cc.length > 4){
    for (let i=0; i<cc.length - 4; i++){
    cc[i] = '#';
  }
  }
  return cc.join('');
}

exercise: https://www.codewars.com/kata/56541980fa08ab47a0000040

function printerError(s) {
    return `${[...s].filter(x => x.match(/[n-z]/)).length}/${s.length}`
}

exerceise: https://www.codewars.com/kata/5648b12ce68d9daa6b000099

var number = function(busStops){
  let num = 0;
  for (let i=0; i<busStops.length; i++){
    num = num + busStops[i][0] - busStops[i][1];
  }
  return num;
}

exercise: https://www.codewars.com/kata/563cf89eb4747c5fb100001b

function removeSmallest(numbers) {
  let numbers2 = numbers.slice(0);
  numbers2.splice(numbers.indexOf(Math.min(...numbers)), 1);
  return numbers2;
}

exercise: https://www.codewars.com/kata/583f158ea20cfcbeb400000a

function arithmetic(a, b, operator){
  return operator == 'add' ?
  a + b :
  operator == 'subtract' ?
  a - b :
  operator == 'multiply' ?
  a * b :
  operator == 'divide' ?
  a / b :
  0;
}

exercise: https://www.codewars.com/kata/5174a4c0f2769dd8b1000003

function solution(nums){
return nums !== null ? nums.sort((a,b) => a-b) : [];
}

exercise: https://www.codewars.com/kata/514b92a657cdc65150000006

function solution(number){
 let res = [];
 for (let i=1; i<number; i++){
  if (i * 3 < number){
    res.push(i * 3);
  }
  if (i * 5 < number){
    res.push(i * 5);
  }
 }
 return number >= 0 ? [... new Set(res)].reduce((a, b) => a + b, 0) : 0;
}

exercise: https://www.codewars.com/kata/5266876b8f4bf2da9b000362

function likes(names) {
  return names.length == 1 ?
  `${names[0]} likes this` :
  names.length == 2 ?
  `${names[0]} and ${names[1]} like this` :
  names.length == 3 ?
  `${names[0]}, ${names[1]} and ${names[2]} like this` :
  names.length > 3 ?
  `${names[0]}, ${names[1]} and ${names.slice(2).length} others like this` :
  `no one likes this`;
}

exercise: https://www.codewars.com/kata/525f50e3b73515a6db000b83

function createPhoneNumber(numbers){
  return `(${numbers[0]}${numbers[1]}${numbers[2]}) ${numbers[3]}${numbers[4]}${numbers[5]}-${numbers[6]}${numbers[7]}${numbers[8]}${numbers[9]}`
}

exercise: https://www.codewars.com/kata/54da5a58ea159efa38000836

function findOdd(A) {
  let a = A.reduce(function (acc, curr) {return acc[curr] ? ++acc[curr] : acc[curr] = 1, acc}, {});
  for (let i=0; i<Object.keys(a).length; i++){
    if (Object.values(a)[i] % 2 == 1){return Number(Object.keys(a)[i]);}
  }
}

exercise: https://www.codewars.com/kata/541c8630095125aba6000c00

function digitalRoot(n) {
if (n < 10) return n;
return digitalRoot(String(n).split('').reduce((partialSum, a) => partialSum + Number(a), 0));
}

exercise: https://www.codewars.com/kata/54bf1c2cd5b56cc47f0007a1

function duplicateCount(text){
return new Set([...text].filter((item, index) => {return [...text].indexOf(item.toLowerCase()) != index}).map(x => x.toLowerCase())).size;
}

exercise: https://www.codewars.com/kata/5264d2b162488dc400000001

function spinWords(string){
  return string.split(' ').map(x => x.length >= 5 ? x.split('').reverse().join('') : x).join(' ');
}

exercise: https://www.codewars.com/kata/5526fc09a1bbd946250002dc

function findOutlier(integers){
  if (integers.filter(a => Math.abs(a)%2 ==0).length > integers.filter(b => Math.abs(b)%2 ==1).length){
    return integers.filter(b => Math.abs(b)%2 ==1)[0]
} else {
  return integers.filter(c => Math.abs(c)%2 ==0)[0]
}};

exercise: https://www.codewars.com/kata/55bf01e5a717a0d57e0000ec

function persistence(num){
  let r = 0;
  while(num >= 10){
    r++;
    num = [...String(num)].reduce((a, b) => a*b, 1);
  };
  return r;
}

exercise: https://www.codewars.com/kata/545cedaa9943f7fe7b000048

function isPangram(string){
  let regex1 = 'abcdefghijklmnoqprstwvyuxz';
  for (let i=0; i<string.length; i++){if(new RegExp(`${regex1.charAt(i)}`, "i").test(string) === false){return false};}
  return true;
}

exercise: https://www.codewars.com/kata/55c45be3b2079eccff00010f

function order(words){
  return words == "" ? "" : words.split(" ").sort((a,b) => Number(a.match(/[0-9]/g)) - Number(b.match(/[0-9]/g))).join(' ');
}

exercise: https://www.codewars.com/kata/54da539698b8a2ad76000228

function isValidWalk(walk) {
 if (walk.length == 10){
  if (walk.filter(a => a == 'n').length == walk.filter(a => a == 's').length){
    if (walk.filter(a => a == 'e').length == walk.filter(a => a == 'w').length){
      return true;
    } else {return false;}
  } else {return false;}
 } else {return false;}
}

exercise: https://www.codewars.com/kata/5287e858c6b5a9678200083c

function narcissistic(value) {
  return String(value).split('').map(a => Math.pow(Number(a), String(value).length)).reduce((a, b) => a+b, 0) == value ? true : false;
}

exercise: https://www.codewars.com/kata/515de9ae9dcfc28eb6000001

function solution(str){
   return str == "" ? [] : str.match(/.{1,2}/g).map(a => String(a).length == 1 ? a.concat('', '_') : a);
}

exercise: https://www.codewars.com/kata/585d7d5adb20cf33cb000235

function findUniq(arr) {
arr = arr.sort((a,b) => a-b);
return arr[0] == arr[1] ? arr[arr.length - 1] : arr[0];
}

exercise: https://www.codewars.com/kata/5262119038c0985a5b00029f

function isPrime(num) {
  if (Number.isInteger(num) && num>1){
    for(let i=2; i<=Math.sqrt(num); i++){if(num % i === 0){return false};}
    return true;
  } else {return false;}
}

exercise: https://www.codewars.com/kata/523f5d21c841566fde000009

function arrayDiff(a, b) {
  for(let i=0; i<=b.length-1; i++){
    a = a.filter((x) => x !== b[i]);
  }
  return a;
}

exercise: https://www.codewars.com/kata/5208f99aee097e6552000148/javascript

function solution(string) {
  return string.replace(/([A-Z])/g, ' $1');
}

exercise: https://www.codewars.com/kata/526571aae218b8ee490006f4

function countBits(n){
  // return (n >>> 0).toString(2).split('').filter((x) => x == 1).length;
  return n.toString(2).split('').filter((x) => x == 1).length;
};

exercise: https://www.codewars.com/kata/578aa45ee9fd15ff4600090d

function sortArray(array) {
  let arrOdd = array.filter((a) => a % 2).sort((b,c) => b - c);
  return array.map((d) => d%2 === 0 ? d : arrOdd.shift());
}

exercise: https://www.codewars.com/kata/57eb8fcdf670e99d9b000272

function high(x){
let y = x.split(' ').map((a) => [...a].reduce((b, c) => b+'abcdefghijklmnopqrstuvwxyz'.split('').indexOf(c)+1, 0));
return x.split(' ')[y.indexOf(Math.max(...y))];
}

exercise: https://www.codewars.com/kata/5839edaa6754d6fec10000a2

function findMissingLetter(array){
  let alph = 'abcdefghijklmnopqrstuvwxyz';
  if(array[0] == array[0].toUpperCase()){alph = alph.toUpperCase();};
  let pieceOfAlph = alph.slice(alph.split('').indexOf(array[0]), alph.split('').indexOf(array[array.length - 1]) + 1);
  return pieceOfAlph.split('').find((a) => array.find((b) => b == a) == undefined);
}

exercise: https://www.codewars.com/kata/54b42f9314d9229fd6000d9c

function duplicateEncode(word){
  let w = word.toLowerCase().split('');
  let duplicates = w.filter((item, index) => {return w.indexOf(item.toLowerCase()) != index});
  return w.map((a) => duplicates.indexOf(a) === -1 ? "(" : ")").join('');
}

exercise: https://www.codewars.com/kata/546f922b54af40e1e90001da

function alphabetPosition(text) {
return text.toLowerCase().split('').map((a) => {if(/[A-Za-z]/.test(a) === true){return 'abcdefghijklmnopqrstuvwxyz'.indexOf(a) + 1} else {return '-';};}).filter((b) => b !== '-').join(' ');
}

exercise: https://www.codewars.com/kata/517abf86da9663f1d2000003/javascript

function toCamelCase(str){
return str.replace(/(?<=[-_])\w/g, function(match){return match.toUpperCase();}).replace(/([-_])/g, '');
}

exercise: https://www.codewars.com/kata/556deca17c58da83c0000

function tribonacci(signature,n){
 if (signature.length >= n){return signature.slice(0, n);}
 else {
  for(let i=3; i<n; i++){signature.push(signature[i-3] + signature[i-2] + signature[i-1])};
  return signature;
 }
}

exercise: https://www.codewars.com/kata/52efefcbcdf57161d4000091/javascript

function count (string) {  
  let count = {};
  [...string].map((s) => count[s] ? count[s]++ : count[s] = 1);
  return count;
}

exercise: https://www.codewars.com/kata/5592e3bd57b64d00f3000047

function findNb(m) {
  let currVol = 1;
  let n = 1;
  while (currVol < m){
    n++;
    currVol = currVol + n ** 3;
  }
  return currVol == m ? n : -1;
}

exercise: https://www.codewars.com/kata/52597aa56021e91c93000cb0

function moveZeros(arr) {
  return arr.filter((a) => a !== 0).concat(arr.filter((b) => b === 0));
}

exercise: https://www.codewars.com/kata/520b9d2ad5c005041100000f

function pigIt(str){
  return str.split(' ').map((a) => {
    if(/[,.?!-]/g.test(a) === false){return a.substring(1) + a.substring(0, 1) + "ay"}
    else {return a};
  }).join(' ');
}

exercise: https://www.codewars.com/kata/52685f7382004e774f0001f7/javascript

function humanReadable (seconds) {
  function lenOfNum(x){return String(x).length == 2 ? x : "0" + String(x);}
  return `${lenOfNum(Math.floor(seconds / 3600))}:${lenOfNum(Math.floor((seconds % 3600) / 60))}:${lenOfNum(seconds - 3600 * Math.floor(seconds / 3600) - 60 * Math.floor((seconds % 3600) / 60))}`;
}

exercise: https://www.codewars.com/kata/513e08acc600c94f01000001

function rgb(r, g, b){
  return [r, g, b].map(x => {
    if(x > 255){x = 255; return x.toString(16).padStart(2, '0').toUpperCase();}
    else if(x < 0){x = 0; return x.toString(16).padStart(2, '0').toUpperCase();}
    else {return x.toString(16).padStart(2, '0').toUpperCase();}
  }).join('');
}

exercise: https://www.codewars.com/kata/52449b062fb80683ec000024/javascript

function generateHashtag (str) {
  let result = '#' + str.split(' ').filter((a) => a !== '').map((b) => b.charAt(0).toUpperCase() + b.slice(1).toLowerCase()).join('');
  return result.length > 140 ? false :
  str.length < 1 ? false :
  result.length < 2 ? false :
  result; 
}

exercise: https://www.codewars.com/kata/530e15517bc88ac656000716

function rot13(message){
  let alphB = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'.repeat(2);
  let alphS = 'abcdefghijklmnopqrstuvwxyz'.repeat(2);
  return message.split('').map((a) => {
    if(/[A-Z]/.test(a) === true){
      return [...alphB][alphB.indexOf(a) + 13];
    } else if (/[a-z]/.test(a) === true){
      return [...alphS][alphS.indexOf(a) + 13];
    } else {
      return a;
    };}).join('');
}

exercise: https://www.codewars.com/kata/525f3eda17c7cd9f9e000b39/javascript

function zero(a) {if(a){return Math.floor(new Function('return ' + `0 ${a}`)());} else {return 0;}}
function one(a) {if(a){return Math.floor(new Function('return ' + `1 ${a}`)());} else {return 1;}}
function two(a) {if(a){return Math.floor(new Function('return ' + `2 ${a}`)());} else {return 2;}}
function three(a) {if(a){return Math.floor(new Function('return ' + `3 ${a}`)());} else {return 3;}}
function four(a) {if(a){return Math.floor(new Function('return ' + `4 ${a}`)());} else {return 4;}}
function five(a) {if(a){return Math.floor(new Function('return ' + `5 ${a}`)());} else {return 5;}}
function six(a) {if(a){return Math.floor(new Function('return ' + `6 ${a}`)());} else {return 6;}}
function seven(a) {if(a){return Math.floor(new Function('return ' + `7 ${a}`)());} else {return 7;}}
function eight(a) {if(a){return Math.floor(new Function('return ' + `8 ${a}`)());} else {return 8;}}
function nine(a) {if(a){return Math.floor(new Function('return ' + `9 ${a}`)());} else {return 9;}}

function plus(b) {return `+ ${b}`;}
function minus(b) {return `- ${b}`;}
function times(b) {return `* ${b}`;}
function dividedBy(b) {return `/ ${b}`;}

exercise: https://www.codewars.com/kata/514a024011ea4fb54200004b/javascript

function domainName(url){
  if(/www/.test(url)){return url.match(/\.(.*?)\./)[1];}
  else if (/www/.test(url) === false && /http/.test(url) === true) {return url.match(/\/\/(.*?)\./)[1];}
  else {return url.match(/^.*?(\.)/)[0].slice(0, -1);}
}

exercise: https://www.codewars.com/kata/54521e9ec8e60bc4de000d6c

function maxSequence(arr){
  let msf = arr[0];
  let cm = arr[0];
  if (arr.length === 0){return 0;}
  else if (Math.max(...arr) < 0){return 0;}
  else {
    for (let i = 1; i < arr.length; i++){
      cm = Math.max(arr[i], cm + arr[i]);
      msf = Math.max(msf, cm);
    }
    return msf;
  } 
}

exercise: https://www.codewars.com/kata/525c65e51bf619685c000059

function cakes(recipe, available) {
  let ans = [];
  // checking if the recipe ingredients list is longer than available ingredients list
  if(Object.keys(recipe).length > Object.keys(available).length){return 0;}
  else{
    //going through every ingredient in the recipe ingredients list
    for(let key of Object.keys(recipe)){
      // if the current ingredient from the recipe ingredients list IS NOT present in the available ingredients list
      if(available.hasOwnProperty(key) === false){return 0;}
      // if the current ingredient from the recipe ingredients list IS present in the available ingredients list
      else {
        ans.push(available[key] / recipe[key]);
      }
    }
    return Math.floor(Math.min(...ans));
  }
}

exercise: https://www.codewars.com/kata/583203e6eb35d7980400002a/javascript

function countSmileys(arr) {
  return arr.length == 0 ? 0 : arr.filter((a) => /^[;:][-~]?[)D]$/.test(a)).length;
}

exercise: https://www.codewars.com/kata/57cebe1dc6fdc20c57000ac9

function findShort(s){
return Math.min(...s.split(' ').map(a => a.length));
}

exercise: https://www.codewars.com/kata/5390bac347d09b7da40006f6

String.prototype.toJadenCase = function () {
  return this.split(' ').map((a) => a.charAt(0).toUpperCase() + a.substr(1)).join(' ');
};

exercise: https://www.codewars.com/kata/550f22f4d758534c1100025a

function dirReduc(arr){
  for (let a=0; a<3; a++){
    for (let i = 0; i < arr.length - 1; i++){
    if(arr[i] == "NORTH" && arr[i+1] == "SOUTH"){arr.splice(i, 2)}
    if(arr[i] == "SOUTH" && arr[i+1] == "NORTH"){arr.splice(i, 2)}
    if(arr[i] == "WEST" && arr[i+1] == "EAST"){arr.splice(i, 2)}
    if(arr[i] == "EAST" && arr[i+1] == "WEST"){arr.splice(i, 2)}
  }
  }
  return arr;
}

exercise: https://www.codewars.com/kata/52bc74d4ac05d0945d00054e

function firstNonRepeatingLetter(str) {
  for(const i in str.toLowerCase()){
    if (str.toLowerCase().indexOf(str.toLowerCase()[i]) == str.toLowerCase().lastIndexOf(str.toLowerCase()[i])){return str[i];}
  }
  return "";
}

exercise: https://www.codewars.com/kata/51f2d1cafc9c0f745c00037d

function solution(str, ending){
  return str.endsWith(ending);
}

exercise: https://www.codewars.com/kata/55f8a9c06c018a0d6e000132

function validatePIN (pin) {
  if (pin.length == 4 || pin.length == 6){
    return /^\d+$/.test(pin) === true ? true : false;
  } else {return false;};
}

exercise: https://www.codewars.com/kata/5656b6906de340bd1b0000ac

function longest(s1, s2) {
  let res = s1.concat('', s2).split('').sort((a, b) => a.localeCompare(b));
  return res.filter((item, index) => {return res.indexOf(item.toLowerCase()) == index}).join('');
}

exercise: https://www.codewars.com/kata/50654ddff44f800200000004/javascript

function multiply(a, b){
  return a * b
}

exercise: https://www.codewars.com/kata/53da3dbb4a5168369a0000fe/javascript

function evenOrOdd(number) {
 return number % 2 == 0 ? "Even" : "Odd";
}

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  1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

  2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

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Some JavaScript exercises solved by me

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