JavaScript filter()

Part of my “Functional JavaScript” programming notes

Syntax:

let newArray = Oldarray.filter(callback(element, index, array)); Explanation:

1. The filter method returns a new array from the filtered items from the oldArray
2. Items are filtered according to some condition
3. To do so a callback function is used
4. The callback function takes 3 arguments:
   1. element: The current element
   2. index: the index of the current element
   3. array: the old array

Use case

Filtering an element/elements of an array based on some condition