JavaScript Array Methods

📄️ filter()

filter() creates a new array that contains all the calling array’s elements that passed the test specified by the method’s argument.

Whenever you use forEach() on an array, the method executes its function argument once for each item of the calling array.

indexOf() searches its calling array for the first occurrence of the method's string argument.

lastIndexOf() searches its calling array for the last occurrence of the method's argument.

map() creates a new array that contains the result of invoking map()'s function argument on each item of the calling array.

JavaScript’s pop() method removes and returns its calling array’s last item. It does not accept any argument.

JavaScript's push() method adds its arguments to the end of its calling array and returns the calling array’s new length.

Whenever you use reduce() on an array, the method uses its function argument to reduce its calling array’s items to a single value.

JavaScript’s shift() method removes and returns its calling array’s first item. It does not accept any argument.

JavaScript's slice() method duplicates a specified part of its calling array into a new array—without altering the original array.

JavaScript's splice() method alters its calling array by adding or removing a specific number of items to/from it.

JavaScript's unshift() method adds its arguments to the beginning of its calling array and returns the calling array’s new length.