map

by Akram kamal

JavaScript

var a = [
  "Hydrogen",
  "Helium",
  "Lithium",
  "Beryl­lium"
];

var a2 = a.map(function(s){ return s.length });
console.log(a2);

//var a3 = a.map( s => s.length );
//console.logt(a3);