
JavaScript Arrays Quiz
Quiz
•
Instructional Technology
•
10th Grade
•
Practice Problem
•
Hard
Zemmary Batucan
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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following is the correct way to create an empty array in JavaScript?
let emptyArray = {};
let emptyArray = [];
let emptyArray = new Array();
Both b) and c)
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the correct syntax to access the second element of an array named colors?
colors[1]
colors.second
colors(1)
colors[2]
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How do you add an element to the end of an array named fruits?
fruits.add("grape");
fruits.push("grape");
fruits.append("grape");
fruits.insert("grape");
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How do you remove the last element from an array named numbers?
numbers.remove();
numbers.pop();
numbers.delete();
numbers.shift();
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What does the length property of an array return?
The index of the last element.
The number of elements in the array.
The type of the array.
The first element of the array.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following is a valid way to create a 2D array in JavaScript?
let matrix = [1, 2, 3, 4, 5, 6];
let matrix = [[1, 2, 3], [4, 5, 6]];
let matrix = { 1: [1, 2, 3], 2: [4, 5, 6] };
let matrix = new Array(2, 3);
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How do you access the element at the second row and first column of a 2D array named matrix?
matrix[1][0]
matrix[0][1]
matrix[2][0]
matrix[0][2]
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