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    <p>OK, I've studied the <a href="http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-262.pdf" rel="nofollow noreferrer">ECMAScript specification (PDF)</a> and I have an explanation which discuses the <a href="http://en.wikipedia.org/wiki/Backus%E2%80%93Naur_Form" rel="nofollow noreferrer">BNF grammar</a>.</p> <p>ECMAScript sources are parsed starting with the main symbol, called <code>Program</code>:</p> <pre><code>Program: SourceElements </code></pre> <p>SourceElements' (recursive) definition is this:</p> <pre><code>SourceElements : SourceElement SourceElements SourceElement </code></pre> <p>The, SourceElement is defined as:</p> <pre><code>SourceElement : Statement FunctionDeclaration </code></pre> <p>What we're interested in is the object literal syntax, so we ignore FunctionDeclaration and look at the Statement symbol:</p> <pre><code>Statement : Block VariableStatement EmptyStatement ExpressionStatement IfStatement IterationStatement ContinueStatement BreakStatement ReturnStatement WithStatement LabelledStatement SwitchStatement ThrowStatement TryStatement </code></pre> <p>I'm not sure if the listing order matters (this is how they are in the spec), but... an object literal is an ExpressionStatement, about which the standards say the following (section 12.4):</p> <blockquote> <p>Note that an ExpressionStatement cannot start with an opening curly brace because that might make it ambiguous with a Block. Also, an ExpressionStatement cannot start with the function keyword because that might make it ambiguous with a FunctionDeclaration.</p> </blockquote> <p>So we may have an expression <strong>at the start of the program</strong>, but it must not start with an opening curly brace (<code>{</code>). That's why the following work OK:</p> <ul> <li><code>({} == false);</code></li> <li><code>alert({} == false);</code></li> <li><code>!{} == false;</code></li> </ul>
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    1. POJavaScript: {}==false is a SyntaxError?
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    1. USIonuț G. Stan
    1. USIonuț G. Stan
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    1. CO-1 Is not a real answer (.. or perhaps I'm just not getting your point). Feel free to enlighten me :)
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    2. COYou're totally right. Is rather a workaround. I'm searching through the ECMAScript 3 specification in order to find the real answer. I'm curious myself too.
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    3. COAye. I undid my down vote.
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