js use strict syntax code example
Example 1: javascript use strict
// Whole-Script Strict Mode Syntax
'use strict';
var v = "Hi! I'm a strict mode script!";
Example 2: strict mode
Strict mode makes several changes to normal JavaScript semantics:
-Eliminates some JavaScript silent errors by changing them to throw errors.
-Fixes mistakes that make it difficult for JavaScript engines to perform
optimizations: strict mode code can sometimes be made to run faster than
identical code that's not strict mode.
-Prohibits some syntax likely to be defined in future versions of ECMAScript.