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    <p>Use <code>.bind()</code> when you want that function to later be called with a certain context, useful in events. Use <code>.call()</code> or <code>.apply()</code> when you want to invoke the function immediately, and modify the context.</p> <p>Call/apply call the function immediately, whereas <code>bind</code> returns a function that, when later executed, will have the correct context set for calling the original function. This way you can maintain context in async callbacks and events.</p> <p>I do this a lot:</p> <pre><code>function MyObject(element) { this.elm = element; element.addEventListener('click', this.onClick.bind(this), false); }; MyObject.prototype.onClick = function(e) { var t=this; //do something with [t]... //without bind the context of this function wouldn't be a MyObject //instance as you would normally expect. }; </code></pre> <p>I use it extensively in Node.js for async callbacks that I want to pass a member method for, but still want the context to be the instance that started the async action.</p> <p>A simple, naive implementation of bind would be like:</p> <pre><code>Function.prototype.bind = function(ctx) { var fn = this; return function() { fn.apply(ctx, arguments); }; }; </code></pre> <p>There is more to it (like passing other args), but you can read more about it and see the real implementation <a href="https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Function/bind" rel="noreferrer">on the MDN</a>.</p> <p>Hope this helps.</p>
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    1. CO@RoyiNamir that is correct, you can use the returned "bound" function later, and the context will be maintained.
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    2. COThat is exactly what `bind` returns.
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    3. CO@RoyiNamir Edited my answer
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