rjmcdonald83 · August 8, 2014 20:32
diff --git a/for_var_scoping.js b/for_var_scoping.js
 var arr = [1,2,3,4];

 for (var i = 0, len = arr.length; i < len; i++) {
  var el = arr[i];
  
  setTimeout(function () {
    console.log(el);
  }, 10);
 }

 // output:
 // 4
 // 4
 // 4
 // 4
diff --git a/map.js b/map.js
 var arr = [1,2,3,4];

 arr.map(function (el) {
  setTimeout(function () {
    console.log(el);
  }, 10)
 })

 // output:
 // 1
 // 2
 // 3
 // 4