JavaScript Strict Mode

المعرفة:: JavaScript
الحالة:: ملاحظة_مؤرشفة
المراجع:: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Strict_mode, The Complete JavaScript Course 2022 From Zero to Expert 

// Whole-script strict mode syntax  
"use strict";  
var v = "Hi! I'm a strict mode script!";
  1. Eliminates some JavaScript silent errors by changing them to throw errors. 
"use strict";  
let mistypeVariable;  
mistypeVarible = 17;  
/* Assuming no global variable mistypeVarible exists, this line throws a ReferenceError due to the misspelling of "mistypeVariable" (lack of an "a") */
  1. Prohibits some syntax likely to be defined in future versions of ECMAScript. E.g. private, interface. 
// Assignment to a non-writable global  
var undefined = 5; // throws a TypeError  
var Infinity = 5; // throws a TypeError
Last update : August 14, 2023
Created : August 23, 2022

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