developer-roadmap/roadmaps/javascript/content/strict-mode@Xw8lb0xCWKmNs4KZfhBUy.md

Strict Mode

Strict mode is an opt-in variant of JavaScript that enforces stricter parsing and error handling. It is enabled by adding "use strict" at the top of a file or function. Strict mode prevents the use of undeclared variables, disallows duplicate parameter names, and makes this undefined in functions called without a context, among other restrictions.

Visit the following resources to learn more:

• @article@Strict mode
• @article@Strict mode in JavaScript