"use strict";. For example:
// Your strict mode code here;
Enabling strict mode at the top of your script applies it to the entire script, while placing it within a function scope enables strict mode only for that specific function.
- Benefits of Strict Mode: Strict mode offers several benefits that contribute to better code quality and maintainability. Here are some key advantages:
3.1. Enhanced Error Handling: Strict mode catches common coding mistakes that would otherwise fail silently or produce unexpected behavior. It throws errors for assignments to undeclared variables, duplicate parameter names, and more, helping you identify and fix issues early in the development process.
3.2. Prevention of Implicit Global Variables: In non-strict mode, omitting the
const keyword when declaring a variable inside a function creates an implicit global variable. This can lead to naming conflicts and make code harder to reason about. Strict mode eliminates this behavior, forcing explicit variable declarations and reducing the chance of unintentional global scope pollution.
3.3. Removal of Deprecated Functionality: Strict mode disables certain features and practices that are considered problematic or deprecated. For instance, it prohibits the use of
- Strict Mode Limitations: While strict mode provides significant benefits, it’s important to be aware of a few limitations:
4.2. Parsing Mode: Strict mode operates at the syntactic level, which means that it only affects how code is parsed and executed. It doesn’t guarantee performance improvements or optimize your code in any way.
Happy coding with strict mode!