1D0-735 Sample Questions & Answers
Debugging and controlling program flow with the Document Object Model is the single biggest topic, alongside core variables, functions, methods and events, modifying HTML and building interactive forms, and using libraries, frameworks and AJAX.
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- Question 1Intermediate
Essential JavaScript Principles and Practices · Functions, Methods, and Events
A developer needs to define a function that will be passed as a callback to an event listener. It is crucial that the
thiskeyword inside the callback refers to the lexical scope where the function was defined, rather than the element that triggered the event. Which type of function syntax handles this automatically?Show answer & explanation
Correct answer: D
Arrow functions do not have their own
thiscontext; they inheritthisfrom the enclosing lexical context. This makes them ideal for callbacks where you want to preserve the context of the surrounding code. - Question 2Beginner
Essential JavaScript Principles and Practices · JavaScript Characteristics and Programming Practices
Which of the following statements accurately describes the behavior of JavaScript when running in a browser environment compared to a server-side environment like Node.js?
Show answer & explanation
Correct answer: D
The Document Object Model (DOM) is a browser-specific API that allows JavaScript to interact with HTML and CSS. Server-side environments like Node.js do not have a DOM by default.
- Question 3Beginner
Essential JavaScript Principles and Practices · Variables, Data Types, and Operators
You need to create a variable that cannot be reassigned after its initial declaration. Attempting to reassign it should throw an error. Which keyword must be used?
Show answer & explanation
Correct answer: B
The
constkeyword creates a read-only reference to a value. It does not mean the value itself is immutable (if it's an object), but the variable identifier cannot be reassigned. - Question 4BeginnerSelect 2
Essential JavaScript Principles and Practices · JavaScript Characteristics and Programming Practices
Which of the following are valid reasons to use the
noscripttag in an HTML document? (Select TWO)Show answer & explanation
Correct answers: A, D
The primary purpose of
noscriptis to provide content for users or agents (like some crawlers) that do not support or have disabled client-side scripting.While modern search engines are better at JS,
noscriptensures critical content is indexed even if the script fails or isn't executed. - Question 5Advanced
Essential JavaScript Principles and Practices · Functions, Methods, and Events
A developer wants to create a function that borrows a method from another object and executes it immediately with a specific
thiscontext and an array of arguments. WhichFunction.prototypemethod should be used?Show answer & explanation
Correct answer: B
apply()invokes the function immediately with a specifiedthisvalue and arguments provided as an array (or array-like object).call()does the same but requires arguments to be listed individually. - Question 6Intermediate
Essential JavaScript Principles and Practices · Functions, Methods, and Events
What is the primary purpose of an Immediately Invoked Function Expression (IIFE) in JavaScript?
Show answer & explanation
Correct answer: D
IIFEs are functions that run as soon as they are defined. They are commonly used to create a fresh scope, keeping variables defined inside them private and preventing them from conflicting with global variables.
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