JSE-40-01 JavaScript Certified Entry-Level Programmer [javascript]

Question 1

What does `Array.prototype.map()` return?

The original array modified in place A new array with each element transformed by the callback A boolean indicating whether all elements passed a test The first element that satisfies a condition

Correct Answer:

A new array with each element transformed by the callback

Question 2

What does `Array.prototype.reduce()` do?

Removes duplicate values from an array Applies a function against an accumulator and each element to reduce the array to a single value Splits an array into chunks Converts an array to an object

Correct Answer:

Applies a function against an accumulator and each element to reduce the array to a single value

Question 3

What is the difference between `Array.prototype.find()` and `Array.prototype.filter()`?

`find()` returns all matches; `filter()` returns the first match `find()` returns the first matching element; `filter()` returns an array of all matches They are identical `find()` searches by index; `filter()` searches by value

Correct Answer:

`find()` returns the first matching element; `filter()` returns an array of all matches

Question 4

What does `Array.prototype.flat()` do?

Sorts the array in ascending order Creates a new array with sub-arrays concatenated into it up to a specified depth Converts the array to a flat string Removes falsy values from the array

Correct Answer:

Creates a new array with sub-arrays concatenated into it up to a specified depth

Question 5

What does `Array.prototype.some()` return?

The first element that passes the test An array of elements that pass the test true if at least one element passes the test, otherwise false The number of elements that pass the test

Correct Answer:

true if at least one element passes the test, otherwise false

Question 1

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About this Exam

Prepare with the JSE-40-01 JavaScript Certified Entry-Level Programmer [javascript] practice quiz. This question bank includes 30 questions covering javascript, array, prototype, approach, and professional. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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JSE-40-01 JavaScript Certified Entry-Level Programmer [javascript]

This practice set contains 30 questions from the matching question bank and focuses on javascript, array, prototype, approach, and professional. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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JSE-40-01 JavaScript Certified Entry-Level Programmer [javascript]

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