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POOverloading Arithmetic Operators in JavaScript?
 

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    <p>This is the best way I can think of phrasing this question, given this JavaScript "class" definition:</p> <pre><code>var Quota = function(hours, minutes, seconds){ if (arguments.length === 3) { this.hours = hours; this.minutes = minutes; this.seconds = seconds; this.totalMilliseconds = Math.floor((hours * 3600000)) + Math.floor((minutes * 60000)) + Math.floor((seconds * 1000)); } else if (arguments.length === 1) { this.totalMilliseconds = hours; this.hours = Math.floor(this.totalMilliseconds / 3600000); this.minutes = Math.floor((this.totalMilliseconds % 3600000) / 60000); this.seconds = Math.floor(((this.totalMilliseconds % 3600000) % 60000) / 1000); } this.padL = function(val){ return (val.toString().length === 1) ? "0" + val : val; }; this.toString = function(){ return this.padL(this.hours) + ":" + this.padL(this.minutes) + ":" + this.padL(this.seconds); }; this.valueOf = function(){ return this.totalMilliseconds; }; }; </code></pre> <p>and the following test setup code:</p> <pre><code>var q1 = new Quota(23, 58, 50); var q2 = new Quota(0, 1, 0); var q3 = new Quota(0, 0, 10); console.log("Quota 01 is " + q1.toString()); // Prints "Quota 01 is 23:58:50" console.log("Quota 02 is " + q2.toString()); // Prints "Quota 02 is 00:01:00" console.log("Quota 03 is " + q3.toString()); // Prints "Quota 03 is 00:00:10" </code></pre> <p>Is there any way of implicitly creating <code>q4</code> as a <code>Quota</code> object using the addition operator as follows...</p> <pre><code>var q4 = q1 + q2 + q3; console.log("Quota 04 is " + q4.toString()); // Prints "Quota 04 is 86400000" </code></pre> <p>rather than resorting to...</p> <pre><code>var q4 = new Quota(q1 + q2 + q3); console.log("Quota 04 is " + q4.toString()); // Prints "Quota 04 is 24:00:00" </code></pre> <p>If not what are the best practice recommendations in this area for making custom numeric JavaScript objects composable via the arithmetic operators?</p>
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