Which statement about the let keyword is true?

let variables are hoisted and initialized to undefined.

let variables are function-scoped.

let variables can be redeclared in the same block.

let variables are block-scoped and can be reassigned.

A developer has an array `const fruits = ['apple', 'banana', 'cherry'];` and needs to add 'date' to the end and 'apricot' to the beginning. Which code correctly modifies the array?

`fruits.push('date'); fruits.unshift('apricot');`

`fruits.splice(0, 0, 'apricot'); fruits.splice(fruits.length, 0, 'date');`

`fruits.push('apricot'); fruits.unshift('date');`

`fruits = ['apricot', ...fruits, 'date'];`

LPI Web Development Essentials

Domain 4Objective 2

034.2 JavaScript Data Structures (weight: 3) WEB-DEVELOPMENT-ESSENTIALS Practice Questions (Page 3)

Part of the 034 JavaScript Programming domain, which makes up ~16% of our current practice bank. Linux Professional Institute does not publish an official question count, but from its 60-minute exam (~25–40 total, ~4–6 in this domain), expect 1–2 from this objective — we provide 26 practice questions to prepare you well beyond it. (estimate)

26questions here

6free pages

10concepts

Questions 11–15

11foundation · easy
Which of the following is a complex data type in JavaScript?
Select an answer first
12foundation · easy
How do you access the third element of an array named fruits?
Select an answer first
13foundation · easy
Which statement about the let keyword is true?
Select an answer first
14application · easy
A developer has an array `const fruits = ['apple', 'banana', 'cherry'];` and needs to add 'date' to the end and 'apricot' to the beginning. Which code correctly modifies the array?
Select an answer first
15foundation · easy
What is the result of '5' + 3 in JavaScript?
Select an answer first

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034.2 JavaScript Data Structures (weight: 3) WEB-DEVELOPMENT-ESSENTIALS Practice Questions (Page 3)

Questions 11–15

Which of the following is a complex data type in JavaScript?

How do you access the third element of an array named fruits?

Which statement about the let keyword is true?

A developer has an array `const fruits = ['apple', 'banana', 'cherry'];` and needs to add 'date' to the end and 'apricot' to the beginning. Which code correctly modifies the array?

What is the result of '5' + 3 in JavaScript?

Keep studying — 034 JavaScript Programming