13th_Oct_Arrays_Loops

// array - sequence of data elements

/*
const seq = [2,3,4,5];
const empt = [];

seq[2]; // indexed

is_null(empt); // false

// data assignment with index

seq[2] = "new"; // change 
// value producing statement^

seq;

seq[4] = "4th";
seq;

seq[9] = 9;
seq;
*/

// [2, 3, "new", 5, "4th", undefined, undefined, undefined, undefined, 9]

// the ones in between become undefined

//array_length(seq);

// random access
// access in O(1) -> constant time


// Assigning to an array element A[i], where index
// i ≥ array_length(A), takes Θ(i – array_length(A)) time


// 2 dimensional arrays









for(let i = 0; i < 10; i = i + 1){
    display(i);
    //i = i + 3; // not allowed in source - thus not equivalent to while loop, // but allowed in javascript
}


// but this works:

/*
let i = 0;
for(i = 0; i<10; i = i+1){
    display(i);
    i = i+3;
}
*/