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POIs there a difference between single/double quoted strings passed to javascript's eval?
 

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  1. POIs there a difference between single/double quoted strings passed to javascript's eval?
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    <p>i have a server message sent via web-sockets. that message is a json (validated) string. when it gets to the browser i check that it is a string with <code>typeof(data)</code> and it tells me that it is, in fact, a string. When finally i do <code>var some_obj = eval( '(' + data + ')' );</code> it gives me an <code>Uncaught SyntaxError: Unexpected token ILLEGAL</code> error.</p> <p>also, before using <code>eval()</code>, i <code>console.log(data)</code> and it displays correctly, although an <code>alert(data)</code> won't show anything on the dialog.</p> <p>i can't understand what's happening.</p> <p>i also tried <code>var myJson = '{ "x": "Hello, World!", "y": [1, 2, 3] }';</code> and then <code>var myObj = eval( '(' + myJson + ')' );</code> and it works, so i really can't understand why mine can't be evaluated (parsed).</p> <p>the string received via web-sockets is this:</p> <pre><code>received 37 bytes » { "cmd": "setname", "params": "ok" } </code></pre> <p>where <code>data = { "cmd": "setname", "params": "ok" }</code> (with quotes i suppose, because of <code>typeof(data)</code> being = string).</p> <p>any tips? thanks</p> <p>edit1 » with web-sockets, you have to prepend a null char (0 ascii) and append a escape char (255 ascii) to the output string from the server. i assume the client (browser) as it implements web-sockets must deal with this and unwrap the string correctly (as the standard) and as i do in my server. thing is, there might be some escape char left and it doesn't deal with it correctly. but the problem only started when i tried to send json strings to be eval()ed. otherwise they work properly as any other string.</p>
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    1. COYou have to understand that the quotes at the beginning (and end) are only there for you and the parser to understand where a string begins (and ends). They are not actually part of the string itself.
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    2. COAre you **sure** `typeof(data)` is `String`? You don't mention `console.log` ing this. I think you'd get the beaviour you describe if data was an object literal and not in fact a string.
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    3. COtypeof(d) » string. Uncaught SyntaxError: Unexpected token ILLEGAL. there is actually something funny happening » when i try to copy from the console, the 'd' (string) with some text before, it doesn't copy... » console.log('received '+d.length+' bytes » ' + d); this is the log command and it generates » received 37 bytes » { "cmd": "setname", "params": "ok" } but i have to manually write it here because i'm not able to copy it!
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