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    <p>First way is when you put <code>"use strict";</code> pragma at first line of .js file. So EVERYTHING in that file will be strictly evaluated.<br> There is nothing inherently wrong with that. Sooner or later all browsers will make 'old js code' deprecated. Only real drawback might be potentially breaking old code if you use it.</p> <p>Second way might be an object like this:</p> <pre><code>var contName = new function () { "use strict"; this.tmp; // public temp var var tmp; // private tmp, propagate thru all! var f = this; // to call contName.functions when this = html or other object var o = this; // to create objects. f.rnd = function rnd (range) { return Math.floor(Math.random() * range); }; function private1 () { // can be called only inside of contName var x = tmp; // can see all outer private vars this.tmp; // !== outer this.tmp var y = this.rnd(x); // will not work var y = f.rnd(x); // work } o.Pixel = function (x, y, z, col) { this.x = x || 0; this.y = y || 0; this.z = z || 0; this.color = col || 0; }; </code></pre> <p>tmp = new o.Pixel(300, 300);</p> <pre><code>} // end </code></pre> <p>That code allows you to have "private" variables. Note that f as also a 'private' var. </p> <p>Usage is simple:</p> <pre><code>var rvar = contName.rnd(5); var obj = new contName.Pixel(300, 300) </code></pre> <hr> <p>Third way might be T.J.Crowder's, fourth is Doug Crockford's ... These are just different ways for emulating something that's not yet officially present in a language.</p>
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    1. POStrict mode in a namespace with Javascript
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    1. CO`var contName = new function() { ...` That construct doesn't do what you think it does. And the OP flagged up that he/she thought there were reasons not to use it globally. (I don't know what those are, as I never do **anything** globally...) And Crockford's name is "Douglas" (or "Doug").
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    2. COIt creates an object. Name corrected ;)
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    3. CORight, it creates an object. Using the `prototype` from the anonymous function you're defining as part of the expression. It's a roundabout, and misleading, way to create an object.
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