If you have latest command-line SpiderMonkey or my little tool
'SyntaxJS' (see https://github.com/ariya/syntaxjs for the code), you
can see the syntax tree produced by the parser.
For the case:
function foo(x) { alert(x); }(1);
the output looks like:
{
"type": "Program",
"body": [{
"type": "FunctionDeclaration",
"id": "foo",
"params": [{
"type": "Identifier",
"name": "x"
}],
"body": {
"type": "BlockStatement",
"body": [{
"type": "ExpressionStatement",
"expression": {
"type": "CallExpression",
"callee": {
"type": "Identifier",
"name": "alert"
},
"arguments": [{
"type": "Identifier",
"name": "x"
}]
}
}]
}
},
{
"type": "ExpressionStatement",
"expression": {
"type": "Literal",
"value": "1"
}
}]
}
Just my 2 cents to the otherwise excellent explanation in this thread.
--
Ariya Hidayat
http://www.linkedin.com/in/ariyahidayat
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