JavaScript forEach() method in 8 minutes! ➿

The forEach() method in JavaScript allows you to loop through array elements and apply a function to each one. The method automatically provides the element, its index, and the array itself to the callback function.

The video demonstrates how to use forEach() with functions to modify numeric array elements. Examples include doubling, tripling, squaring, and cubing each number in an array by updating the array at the given index within the callback function.

This section explains how to use forEach() to manipulate strings in an array. It shows examples of converting strings to uppercase, lowercase, and capitalizing the first letter of each string using dedicated functions as callbacks.

A more advanced example demonstrates capitalizing the first letter of each string in an array. This involves extracting the first character, converting it to uppercase, and then concatenating it with the rest of the string (sliced from the second character onwards).

The forEach() method is a powerful tool for iterating over array elements and applying a specified callback function to each. It's particularly useful when you need to perform the same operation on every element of an array.