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===eval (expression) ===
Evaluates the first parameter as an expression, which can include assignment statements. Variables local to functions can be referenced by the expression. However, {{code|eval}} represents a major security risk, as it allows a bad actor to execute arbitrary code, so its use is discouraged.<ref name="deve_eval">{{cite web |title=eval() |work=MDN Web Docs |access-date=29 January 2020 |url= https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/eval#Never_use_eval!}}</ref>
<syntaxhighlight lang="
> (function foo() {
... var x = 7;
... console.log("val " + eval("x + 2"));
... })();
val 9
undefined
</syntaxhighlight>
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