# Callbacks nuances in JavaScript

Callbacks don't have to be anonymous functions. For example, let's say we have the following function:

`function square(num) { return num ** 2; }`

Let's use it to square each element of the array:

`function square(num) { return num * num; } let result = each([1, 2, 3, 4, 5], square); console.log(result);`

Use the following function to cube all the elements of an array:

`function cube(num) { return num ** 3; }`
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