Web Reference: Mar 23, 2026 · JavaScript's strict mode is a way to opt in to a restricted variant of JavaScript, thereby implicitly opting-out of "sloppy mode". Strict mode isn't just a subset: it intentionally has different semantics from normal code. The purpose of "use strict" is to indicate that the code should be executed in "strict mode". With strict mode, you can not, for example, use undeclared variables. Feb 6, 2024 · If you are a JavaScript developer, you may come across the string "use strict" at the top of your JavaScript code. This means that JavaScript's strict mode is in use. But what does this mean, and why does it matter? In this article, you'll learn what...
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