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    <p>You can create a <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperty" rel="nofollow">property</a> and set it as non-writable. Your constructor would have to replace the values with the properties. If the variable that the property is returning is captured in a closure and not exposed to anything else, it will be as good as read-only. If it is not changed, you don't even need a closure, just use the <code>value</code> configuration option.</p> <p>EDIT: As per your demand,</p> <pre><code>var Properties = function(obj) { var makePropRecursive = function(prop) { var old_prop = obj[prop]; delete obj[prop]; var prop_obj = {}; for (var attr in old_prop) { if (old_prop.hasOwnProperty(attr)) { Object.defineProperty(prop_obj, attr, { value: old_prop[attr], writable: false, enumerable: true }); } } Object.defineProperty(obj, prop, { value: prop_obj, writable: false, enumerable: true }); }; makePropRecursive('header'); makePropRecursive('footer'); return obj; }; var props = new Properties({ modal_window:{ backdrop:true, keyboard:true, show:true, remote:false, type:{ normal:function(){ this.footer.button.accept.type='btn btn-primary'; this.header.type='modal-header'; }, success:function(){ this.footer.button.accept.type='btn btn-success'; this.header.type='modal-header alert alert-success'; }, info:function(){ this.footer.button.accept.type='btn btn-info'; this.header.type='modal-header alert alert-info'; }, error:function(){ this.footer.button.accept.type='btn btn-danger'; this.header.type='modal-header alert alert-error'; }, warning:function(){ this.footer.button.accept.type='btn btn-warning'; this.header.type='modal-header alert'; } } }, header:{ title:"Whatever", type:"Type" }, footer:{ button: { accept:{ title:'Accept', click:undefined, type:undefined }, cancel:{ title:'Cancel', click:undefined } } } }); console.log(props.header); props.header = 17; props.header.type = 18; props.header.title = 19; console.log(props.header); </code></pre> <p><code>props.header</code> is unchanged: output shows</p> <pre><code>Object {title: "Whatever", type: "Type"} Object {title: "Whatever", type: "Type"} </code></pre> <p>It's 3am and the recursive function isn't, so you can only "fix" one level of one object; also, it would be better if the values were copied onto <code>this</code> rather than returning <code>obj</code>; but it should not be too hard to polish it up.</p> <p>If you need to have the values changeable, you can set up a private copy of the whole object inside the constructor, then make a getter (<code>get: function(name) { return stuff.from.the.original.object }</code>).</p>
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    1. POIs it possible to create read only members in JavaScript Object Literal Notation?
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    1. COExample please.
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    2. COI think you misunderstood the question like I first did.
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    3. CO@plalx: Yeah, went with static readonly attributes. Last paragraph briefly explains how to do it for privately writeable readonly attributes, but I really need my sleep :p You got an upvote from me as soon as I read it, if it means anything.
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