JavaScript Strict Mode

Enabling Strict Mode

'use strict';

// Or in function
function myFunction() {
  'use strict';
}

What It Does

• Prevents accidental globals
• Disallows duplicate parameters
• Makes 'this' undefined in functions
• Throws errors for unsafe operations

Key Takeaway

Strict mode prevents common errors. Use 'use strict' at top of files. Modern JavaScript best practice.