for loops and the crazy i

for-loops.js

/* jshint node: true */


var i = 0;
var len = 5;

for(; i<len; i++) {
  // a => 0, 1, 2, 3, 4
  setTimeout(a.bind(null, i));

  // b => 0, 1, 2, 3, 4
  setTimeout(b(i));

  // c => 5, 5, 5, 5, 5
  setTimeout(function() {
    c(i);
  });
}


function a(i) {
  console.log('a', i);
}

function b(i) {
  return function() {
    console.log('b', i);
  };
}

function c(i) {
  console.log('c', i);
}