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    <p>Why is nobody providing the correct answer? You NEVER iterate arrays with a <code>for/in</code> loop - that is only for iterating plain objects and their keys, not for iterating the items in an array.</p> <p>You iterate arrays for a for loop like this:</p> <pre><code>var words = ['word1', 'word2', 'word3']; for (var i = 0, len = words.length; i &lt; len; i++) { // here words[i] is the array element } </code></pre> <p>Or, in a modern browser, you can use the <code>.forEach()</code> method of arrays:</p> <pre><code>var words = ['word1', 'word2', 'word3']; words.forEach(function(value, index, array) { // here value is the array element being iterated }); </code></pre> <p>See <a href="https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/forEach" rel="nofollow noreferrer">here at MDN</a> for more info on <code>.forEach()</code>.</p> <p>ndp's reference to <a href="https://stackoverflow.com/questions/500504/javascript-for-in-with-arrays/500531#500531">this post</a> shows some good examples of things that can go wrong using <code>for/in</code> with arrays. You can make it works sometimes, but it is not the smart way to write Javascript array iteration.</p> <hr> <p>Or, in more modern times, you can use the ES6 <code>for/of</code> construct which is specially built for iterating an iterable (an array is an iterable):</p> <pre><code>var words = ['word1', 'word2', 'word3']; for (const w of words) { console.log(w); } </code></pre> <p>Or, if you want both the value and the index, you can do this:</p> <pre><code>var words = ['word1', 'word2', 'word3']; for (const [index, w] of words.entries()) { console.log(index, ": ", w); } </code></pre> <p>There are several advantages of <code>for/of</code> over <code>.forEach()</code>. To start with, you have more loop control as you can use <code>break</code>, <code>continue</code>, <code>return</code> to control the loop flow which <code>.forEach()</code> does not give you. In addition, there's no additional overhead for a callback function so, in some environments, it can be faster. </p>
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    1. COThanks for the answer.
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