/*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.*/

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