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    <p><strong>Edit</strong>: added pretty-printing.</p> <p>You could <code>JSON.stringify()</code> the argument of the constructor, if it is JSON-compatible. Here is a <code>toString()</code> function that builds on this idea, but with a slightly generalized version of <code>JSON.stringify()</code> that accepts stringifying functions:</p> <pre><code>function Shape(x){ this.x = x; } Shape.prototype.toString = function() { function stringify(data, prefix) { function unicode_escape(c) { var s = c.charCodeAt(0).toString(16); while (s.length &lt; 4) s = "0" + s; return "\\u" + s; } if (!prefix) prefix = ""; switch (typeof data) { case "object": // object, array or null if (data == null) return "null"; var i, pieces = [], before, after; var indent = prefix + " "; if (data instanceof Array) { for (i = 0; i &lt; data.length; i++) pieces.push(stringify(data[i], indent)); before = "[\n"; after = "]"; } else { for (i in data) pieces.push(i + ": " + stringify(data[i], indent)); before = "{\n"; after = "}"; } return before + indent + pieces.join(",\n" + indent) + "\n" + prefix + after; case "string": data = data.replace(/\\/g, "\\\\").replace(/"/g, '\\"') .replace(/\n/g, "\\n").replace(/\r/g, "\\r") .replace(/\t/g, "\\t") .replace(/[\x00-\x19]/g, unicode_escape); return '"' + data + '"'; default: return String(data).replace(/\n/g, "\n" + prefix); } } return "new Shape(" + stringify(this.x) + ")"; }; var rect = new Shape({color : 'rgba(0,0,0,1)' , x : 0 , y : 0 , w : 100 , h : 100 , draw : function() {ctx.fillStyle = this.color; ctx.fillRect(this.x,this.y,this.w,this.h); } }); console.log(rect.toString()); </code></pre> <p>The output is:</p> <pre><code>new Shape({ color: "rgba(0,0,0,1)", x: 0, y: 0, w: 100, h: 100, draw: function() { ctx.fillStyle = this.color; ctx.fillRect(this.x, this.y, this.w, this.h); } }) </code></pre>
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    1. POJavascript object get code as string
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    1. COwow I did not expect this many answers. Perhaps I should explain why I asked this question in the first place. I will edit again.
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    2. COI edited my question again. I explain why I need it, and why I need not only the structure of the object, but the structure of the code itself. Therefore, I need, for aesthetic reasons, the tabs, spaces, and new line characters. Otherwise the user will type something, save it, and then when they reopen it, all of a sudden all of the code has been flattened to a single line only
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    3. COThere is no way you can recover the original spaces, tabs and newlines, unless the code is saved as a string in the first place (which may actually be the easiest path to follow). I edited my answer to improve the aesthetics of the output. However, this `toString()` is actually re-indenting with my indent style (four space indent, no space before ':'...), although the code was originally input using your style. You can obviously edit `toString()` to fit your style.
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