Question

93

Is there any way to check if strict mode is enforced?

rated 0 times [ 100] [ 7] / answers: 1 / hits: 22087 / 12 Years ago, mon, may 7, 2012, 12:00:00

Is there anyway to check if strict mode 'use strict' is enforced , and we want to execute different code for strict mode and other code for non-strict mode.
Looking for function like isStrictMode();//boolean

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koltenb

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2 Years ago

answered 12 Years ago jarod · Accepted Answer

The fact that this inside a function called in the global context will not point to the global object can be used to detect strict mode:

var isStrict = (function() { return !this; })();

Demo:

> echo 'use strict; var isStrict = (function() { return !this; })(); console.log(isStrict);' | node

true

> echo 'var isStrict = (function() { return !this; })(); console.log(isStrict);' | node

false