To enable strict mode, you simply add the following line at the top of a script or a function:
Here are the details of how strict mode works and its benefits, along with examples:
Benefits of Strict Mode
Strict mode catches silent errors and throws exceptions for them. This helps in avoiding bugs that might otherwise be hard to diagnose.
Strict mode disables certain features that are considered error-prone or deprecated. This encourages using modern and reliable coding practices.
In strict mode, variables must be declared with var, let, or const. Undeclared variables will throw errors.
In non-strict mode, assignments to undeclared variables create global variables. Strict mode prevents this behavior, reducing the risk of accidentally polluting the global namespace.
Strict mode disallows assignments to non-writable properties and properties of non-extensible objects.
In strict mode, functions have their own scope, and variables declared within functions are not accessible outside them.Examples: