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// By default undifined is returned for all the functions.
// function add(a, b){
// return a+b;
// }
// console.log(add(3,5));
// function sub(a, b){
// return a-b;
// }
// console.log(sub(-10, -20));
// var sub=function(a, b){ // This is known as function expression, function expression is of two types, named and unnamed, and the function without any name is known as anomynomous function.