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JavaScript Arrays
Question 1
How do you loop through an array in JavaScript?
- A
for (i = 0; i < arr.length; i++)
- B
while (i < arr.length)
- C
do while (i < arr.length)
- D
for each (element in arr)
Question 2
Which of the following statements creates a new empty array?
- A
let arr = [ ];
- B
let arr = new Array(0);
- C
let arr = Array();
- D
All of the above
Question 3
How do you access an element in an array?
- A
By using curly braces { }
- B
By using square brackets [ ]
- C
By using parentheses ( )
- D
By using angle brackets < >
Question 4
Which of the following array methods can be used to add one or more elements to the end of an array?
- A
push()
- B
pop()
- C
shift()
- D
unshift()
Question 5
What is the output of the following code snippet?
let arr1 = [1, 2, 3];
let arr2 = arr1;
arr2.push(4);
console.log(arr1);
- A
[1, 2, 3]
- B
[1, 2, 3, 4]
- C
[2, 3, 4]
- D
None of the above
Question 6
Which of the following array methods can be used to remove the last element from an array?
- A
pop()
- B
shift()
- C
unshift()
- D
splice()
Question 7
Which of the following array methods can be used to remove one or more elements from an array and replace them with new elements?
- A
splice()
- B
slice()
- C
concat()
- D
push()
Question 8
What is the output of the following code snippet?
let arr1 = [1, 2, 3];
let arr2 = [4, 5, 6];
let arr3 = arr1.concat(arr2);
console.log(arr3);
- A
[1, 2, 3, 4, 5, 6]
- B
[4, 5, 6, 1, 2, 3]
- C
[1, 4, 2, 5, 3, 6]
- D
None of the above
Question 9
What is the output of the following code snippet?
const arr = ["apple", "banana", "orange"];
const newArr = arr.slice(1, 2);
console.log(newArr);
- A
["apple", "banana"]
- B
["banana", "orange"]
- C
["banana"]
- D
["orange"]
Question 10
What is the difference between slice() and splice() array methods?
- A
slice() creates a new array, while splice() modifies the original array.
- B
splice() creates a new array, while slice() modifies the original array.
- C
slice() removes elements from the beginning of the array, while splice() removes elements from the end of the array.
- D
splice() adds elements to the beginning of the array, while slice() adds elements to the end of the array.
There are 10 questions to complete.
