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POParse JSON String into a Particular Object Prototype in JavaScript
 

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  1. POParse JSON String into a Particular Object Prototype in JavaScript
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    <p>I know how to parse a JSON String and turn it into a JavaScript Object. You can use <code>JSON.parse()</code> in modern browsers (and IE9+).</p> <p>That's great, but how can I take that JavaScript Object and turn it into a <em>particular</em> JavaScript Object (i.e. with a certain prototype)?</p> <p>For example, suppose you have:</p> <pre><code>function Foo() { this.a = 3; this.b = 2; this.test = function() {return this.a*this.b;}; } var fooObj = new Foo(); alert(fooObj.test() ); //Prints 6 var fooJSON = JSON.parse({"a":4, "b": 3}); //Something to convert fooJSON into a Foo Object //....... (this is what I am missing) alert(fooJSON.test() ); //Prints 12 </code></pre> <p>Again, I am not wondering how to convert a JSON string into a generic JavaScript Object. I want to know how to convert a JSON string into a "Foo" Object. That is, my Object should now have a function 'test' and properties 'a' and 'b'.</p> <p><strong>UPDATE</strong> After doing some research, I thought of this...</p> <pre><code>Object.cast = function cast(rawObj, constructor) { var obj = new constructor(); for(var i in rawObj) obj[i] = rawObj[i]; return obj; } var fooJSON = Object.cast({"a":4, "b": 3}, Foo); </code></pre> <p>Will that work?</p> <p><strong>UPDATE May, 2017</strong>: The "modern" way of doing this, is via <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign" rel="noreferrer"><code>Object.assign</code></a>, but this function is not available in IE 11 or older Android browsers.</p>
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