Is there any reason for which
eval("(function(x){return x*x;})")
doesn’t return a function with IE9?
Is there any reason for which eval((function(x){return x*x;})) doesn’t return a function with IE9?
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Is there any reason for which
eval("(function(x){return x*x;})")
doesn’t return a function with IE9?
It’s a bug in the JScript parser. It shouldn’t happen in IE9 unless you are in a Compatibility or Quirks mode.
IE8 misinterprets your function expression as a function declaration, causing it to fail to return anything. Previously mentioned in this question.
You can work around it using one of the other typical ways to unconfuse the JScript parser on what constitutes an expression vs a statement, eg: