TD: Best Practices: Iterating over Arrays

To iterate over an array `arr`, you have two options:

A simple for loop (see for):

for (var i=0; i<arr.length; i++) {
    console.log(arr[i]);
}

One of the array iteration methods (see Iteration (Nondestructive)). For example,forEach():
```
arr.forEach(function (elem) {
    console.log(elem);
});
```

Do not use the for-in loop (see for-in) to iterate over arrays. It iterates over indices, not over values. And it includes the keys of normal properties while doing so, including inherited ones.

http://speakingjs.com/es5/ch18.html

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Best Practices: Iterating over Arrays

To iterate over an array arr, you have two options:

To iterate over an array `arr`, you have two options: