What is the use of the 'strict mode' in JavaScript?

Strict mode is a feature of JavaScript that was introduced in ECMAScript 5 (ES5) to enable a stricter syntax and semantics for the language. When strict mode is enabled, certain actions that were previously silently ignored or treated as errors will now generate an error, making it easier to write more robust and reliable code.

Here are some of the benefits of using strict mode in JavaScript:

  1. Makes debugging easier: Strict mode eliminates some silent errors by throwing exceptions, which can make debugging easier and faster.

  2. Prevents accidental global variables: In strict mode, any variable declared without the “var”, “let”, or “const” keyword is considered a syntax error, preventing accidental creation of global variables.

  3. Disallows duplicate property names: In strict mode, creating an object with duplicate property names will result in a syntax error, making it easier to identify and resolve errors in the code.

  4. Makes eval() safer: In strict mode, the use of the eval() function is restricted and certain actions that were previously allowed in non-strict mode are now considered errors, making it harder for attackers to exploit vulnerabilities in the code.

To enable strict mode in your JavaScript code, add the following statement to the top of your file or function:

"use strict";

You can also enable strict mode for a specific function by adding the statement to the beginning of the function definition.

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