1forEach() just loop through the elements. It's throws away return values and always returns undefined.The result of this method does not give us an output .
2
3map() loop through the elements allocates memory and stores return values by iterating main array
4
5Example:
6
7   var numbers = [2,3,5,7];
8
9   var forEachNum = numbers.forEach(function(number){
10      return number
11   })
12   console.log(forEachNum)
13   //output undefined
14
15   var mapNum = numbers.map(function(number){
16      return number
17   })
18   console.log(mapNum)
19   //output [2,3,5,7]
20map() is faster than forEach()