JSFiddle - React, Tailwind, and code Playground

by Martin MalĂ˝

JavaScript

map = function(xs, fn) {
    var results = [];
    if (xs === null) {return results;}
    for (var i=0; i<xs.length; i++) {
      results[results.length] = fn(xs[i]);
    };
    return results;
  };


var a = [1, 2, 3, 4, 5, 6];
y = map(a, function(i){return i*2;});
alert(y);