D280 ITSW 3151 JavaScript Programming LATEST COMPLETE FA GUIDE 2024 1. Multiple Choice: What is the purpose of the 'use strict' directive in JavaScript? a) To enable secure mode in JavaScript. b) To enforce stricter parsing and error handling in your code. c) To prevent the use of global variables. d) To activate ECMAScript 6 features. Answer : b) To enforce stricter parsing and error handling in your code. Rationale: The 'use strict' directive is a way to voluntarily enforce stricter parsing and execution of JavaScript code, helping you catch common coding bloopers, preventing 'bad' syntax, and reducing security vulnerabilities. 2. Fill-in-the-Blank: The _______ method is used to asynchronously load a script into a web page. Answer : 'async' Rationale: The 'async' attribute is used in script tags to load scripts asynchronously, allowing the rest of the web page to load without waiting for the script to complete. 3. True/False: In JavaScript, null is considered a type of object. Answer : True Rationale: According to the ECMAScript specification, the value null is considered a primitive value that represents the intentional absence of any object value, and `typeof null` returns 'object'. 4. Multiple Choice: Which of the following is not a valid way to declare a variable in JavaScript? a) let b) const c) var d) set Answer : d) set Rationale: 'set' is not a va lid keyword for declaring variables in JavaScript. 'let', 'const', and 'var' are the correct keywords to declare variables. 5. Fill -in-the-Blank: To define a class in JavaScript, the keyword _______ is used. Answer : 'class' Rationale: The 'class' keyword is used to define a class in JavaScript, which is a type of function that can be used to create objects and handle inheritance. 6. True/False: The arrow function syntax is equivalent in every way to function expressions. Answer : False Rationale: Arrow functions differ from traditional function expressions in several ways, including the 'this' context, which in arrow functions does not bind its own 'this' but inherits it from the parent scope.
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