Javascript square all element in array not working

Question

function square(arr) {
   var result=[].concat(arr);
   result.forEach(function(i){
      i=i*i;
      console.log(i);
   })
   return result;
 }
var arr=[1,2,3,4];
cons         


        

Answer 1

You could define a square function for a single value as callback for Array#map for getting a squared array.

function square(v) {
    return v * v;
}

var array = [1, 2, 3, 4];

console.log(array.map(square));