split in JavaScript

Given the string '1-2-3-4-5'. Use the split method to write each number in this string into a separate array element.

Given the string '12345'. Use the split method to write each character of this string into a separate array element.

Given the following array:

let arr = [1, 2, 3, 4, 5];

Use the join method to merge it into the string '1-2-3-4-5'.

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