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copied!<p><a href="http://javascriptissexy.com/javascript-apply-call-and-bind-methods-are-essential-for-javascript-professionals/" rel="noreferrer">bind</a> allows-</p> <ul> <li>set the value of "this" to an specific object. This becomes very helpful as sometimes <a href="http://javascriptissexy.com/understand-javascripts-this-with-clarity-and-master-it/" rel="noreferrer">this</a> is not what is intended.</li> <li>reuse methods</li> <li>curry a function</li> </ul> <p>For example, you have a function to deduct monthly club fees</p> <pre><code>function getMonthlyFee(fee){ var remaining = this.total - fee; this.total = remaining; return this.name +' remaining balance:'+remaining; } </code></pre> <p>Now you want to reuse this function for a different club member. Note that the monthly fee will vary from member to member. </p> <p>Let's imagine Rachel has a balance of 500, and a monthly membership fee of 90.</p> <pre><code>var rachel = {name:'Rachel Green', total:500}; </code></pre> <p>Now, create a function that can be used again and again to deduct the fee from her account every month</p> <pre><code>//bind var getRachelFee = getMonthlyFee.bind(rachel, 90); //deduct getRachelFee();//Rachel Green remaining balance:410 getRachelFee();//Rachel Green remaining balance:320 </code></pre> <p>Now, the same getMonthlyFee function could be used for another member with a different membership fee. For Example, Ross Geller has a 250 balance and a monthly fee of 25</p> <pre><code>var ross = {name:'Ross Geller', total:250}; //bind var getRossFee = getMonthlyFee.bind(ross, 25); //deduct getRossFee(); //Ross Geller remaining balance:225 getRossFee(); //Ross Geller remaining balance:200 </code></pre>

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