Front End Developer – Interview Questions(github.com)

    f.apply(this, arrayOfArgs); // Array

    f.call(this, arg1, arg2, arg3); // Columns

  - bind
  - function creator outside of the loop called from within
  - create an anon function on each loop iteration that acts like the function creator in #2

  function foo(s) {
    function generator(i) {
      return function () {
        return i;
      };
    }

    var r = new Array(s);
    
    for (var i = 0; i < s; i++) {
      r[i] = generator(i);
    }
    
    return r;
  }

  console.log(foo(1000)[42]());

  function foo(s) {
    function generator(i) {
      return i;
    }

    var r = new Array(s);
    
    for (var i = 0; i < s; i++) {
      r[i] = generator.bind(window, i);
    }
    
    return r;
  }

  console.log(foo(1000)[42]());

  var count = 1000000;
  var arr = foo(count);
  for (var i = 0; i < count; i++)
    arr[i]();

    // new Array(n) could just be [] in all examples
    //
    // using Array.prototype.map
    // sadly you can't do new Array(n).map
    // because it doesn't iterate over undefined functions
    function foo(n) {
      for (var ret = new Array(n), i = 0; i < n; ++i) {
        ret[i] = i;
      }
      return ret.map(function(_,n) { return function() { return n; }; });
    }

    // using Function.prototype.bind in a couple ways
    function foo(n) {
      function num() { return +this; }
      for (var ret = new Array(n), i = 0; i < n; ++i) {
        ret[i] = num.bind(i);
      }
      return ret;
    }

    function foo(n) {
      function num(a) { return a; }
      for (var ret = new Array(n), i = 0; i < n; ++i) {
        ret[i] = num.bind(null, i); // could bind this to pretty much whatever here
      }
      return ret;
    }