Discussion on: Angular: How to build a full screen calendar like Outlook

Hi surajKurade!

For this example it wouldn't make any difference to be honest. Map and ForEach both iterate the array and apply the given function, their difference is that ForEach doesn't return a value just iterates the array and executes the given function on the elements but map will return a new array with the modified array.

Usually people are using map when they want to achieve immutability (they don't want to modify their array but to return a modified copy)

Example:

let nums = [1,2,3];
let result = nums.forEach(n => n*2); // here the result variable will be undefined
let result = nums.map(n => n*2) // here the result variable will be [2, 4, 6]

Hope this helps!