In addition to being obtuse from a syntax perspective, function constructors are also dangerous: their execution evaluates the constructor's string arguments similar to the way ``++eval++`` works, which could expose your program to random, unintended code which can be both slow and a security risk.
In general it is better to avoid it altogether, particularly when used to parse JSON data. You should use ECMAScript 5's built-in JSON functions or a dedicated library.
== Noncompliant Code Example
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var obj = new Function("return " + data)(); // Noncompliant
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== Compliant Solution
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var obj = JSON.parse(data);
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== Exceptions
Function calls where the argument is a string literal (e.g. ``++(Function('return this'))()++``) are ignored.
