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POPass a string by reference in Javascript
 

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  1. POPass a string by reference in Javascript
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    <p>I want to create a string and pass it by reference such that I can change a single variable and have that propagate to any other object that references it.</p> <p>Take this example:</p> <pre><code>function Report(a, b) { this.ShowMe = function() { alert(a + " of " + b); } } var metric = new String("count"); var a = new Report(metric, "a"); var b = new Report(metric, "b"); var c = new Report(metric, "c"); a.ShowMe(); // outputs: "count of a"; b.ShowMe(); // outputs: "count of b"; c.ShowMe(); // outputs: "count of c"; </code></pre> <p>I want to be able to have this happen:</p> <pre><code>var metric = new String("count"); var a = new Report(metric, "a"); var b = new Report(metric, "b"); var c = new Report(metric, "c"); a.ShowMe(); // outputs: "count of a"; metric = new String("avg"); b.ShowMe(); // outputs: "avg of b"; c.ShowMe(); // outputs: "avg of c"; </code></pre> <p>Why doesn't this work?</p> <p>The <a href="https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Global_Objects/String" rel="noreferrer">MDC reference on strings</a> says metric is an object.</p> <p>I've tried this, which is not what I want, but is very close:</p> <pre><code>var metric = {toString:function(){ return "count";}}; var a = new Report(metric, "a"); var b = new Report(metric, "b"); var c = new Report(metric, "c"); a.ShowMe(); // outputs: "count of a"; metric.toString = function(){ return "avg";}; // notice I had to change the function b.ShowMe(); // outputs: "avg of b"; c.ShowMe(); // outputs: "avg of c"; alert(String(metric).charAt(1)); // notice I had to use the String constructor // I want to be able to call this: // metric.charAt(1) </code></pre> <p>The important points here:</p> <ol> <li>I want to be able to use <strong>metric</strong> like it's a normal string object</li> <li>I want each report to reference the same object.</li> </ol>
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