[Codewars] Testing 1-2-3 (7 kyu) / JavaScript

https://www.codewars.com/kata/54bf85e3d5b56c7a05000cf9

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DESCRIPTION:

Your team is writing a fancy new text editor and you've been tasked with implementing the line numbering.

Write a function which takes a list of strings and returns each line prepended by the correct number.

The numbering starts at 1. The format is n: string. Notice the colon and space in between.

 

Examples: (Input --> Output)

[] --> []
["a", "b", "c"] --> ["1: a", "2: b", "3: c"]

 

코드

var number=function(array){
  return array.map((el, i) => i + 1 + ": " + el);
}