Blog

Question 1:  Which method adds one or more elements to the end of an array and returns the new length of the array?

(A) push()

(B) pop()

(C) shift()

Question 2:  Which method removes the last element from an array and returns that element?

(A) shift()

(B) pop()

(C) unshift()

Question 3:  Which property returns the number of elements in an array?

(A) size

(B) count

(C) length

Question 4:  Which method creates a new array with all elements that pass a test implemented by a provided function?

(A) filter()

(B) map()

(C) forEach()

Question 5:  Which method executes a function once for each array element?

(A) forEach()

(B) map()

(C) reduce()

Question 6:  Which method joins two or more arrays and returns a new array?

(A) concat()

(B) splice()

(C) slice()

Question 7:  Which method returns the first index at which a given element is found in an array?

(A) indexOf()

(B) findIndex()

(C) includes()

Question 8:  Which method removes the first element from an array and returns that removed element?

(A) shift()

(B) pop()

(C) splice()

Question 9:  Which method returns true if an array includes a certain element?

(A) find()

(B) includes()

(C) some()

Question 10:  Which method sorts the elements of an array in place and returns the sorted array?

(A) sort()

(B) reverse()

(C) filter()