# map method to iterate over an array in JavaScript

`map`

Given an array of numbers. Using the `map` method, extract the square root of each array element and write the result to a new array.

Given an array with strings. Using the `map` method, add the character `'!'` to the end of the value of each array element.

Given an array with strings. Using the `map` method, reverse the characters of each string.

Given the following array:

`let arr = ['123', '456', '789'];`

Using the `map` method, transform this array into the following:

`let arr = [ [1, 2, 3], [4, 5, 6], [7, 8, 9] ];`

Given an array of numbers. Using the `map` method, write to each element of the array the value of this element multiplied by its index number in the array.

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