Difference between Javascript Map & Filter Method -

Difference between Javascript Map & Filter Method  -

Program I: 

var arr = [4, 24, 65, 13, 98];

var newArray = arr.map((i) => i + 20);

console.log(newArray);

Output:

(5) [24, 44, 85, 33, 118]

Program II: 

var arr = [4, 24, 65, 13, 98];

var newFilter = arr.filter((i) => i + 20);

console.log(newFilter );

Output:

(5) [4, 24, 65, 13, 98]

Finally, Ouput indicates that the main difference in using the map & filter is that filter doesn't change the value of array element while map can have the updated values for the elements. 

Map & Filter both method return the new array.

Map methos keeps all the indexes in the new Array while Filter keep only the true case index in new array.