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You can also enable string mode for a particular function by adding ‘use strict’; or “use strict”; at the beginning of the function.
Syntax:
functionfunctionName() { ‘use strict’; // function body}// orfunctionfunctionName() { "use strict"; // function body} |
This statement should be the first statement of the function excluding comments.
Adding ‘use strict’; or “use strict”; at the beginning of a function has a local scope which means all the code in that script is executed usually and the code inside the function will only execute in strict mode.
Example:
functionName() { // Function without strict mode name = "Rack" console.log("Name is: "+ name) // No error here}functionAge() { // Function with strict mode "use strict"; age = "22" console.log("Age is: "+ age) // Error here}Name()Age() |
Output:
Name is: RackC:\Users\ag290\OneDrive\Desktop\journalDev-2023\january\strict mode\app.js:8 age = "22" ^ReferenceError: age is not defined |
