Array.methods()

Question 1

.concat()

Answer 1

Joins two or more arrays, and returns a copy of the joined arrays

Question 2

.copyWithin()

Answer 2

Copies array elements within the array, to and from specified positions

Question 3

.entries()

Answer 3

Returns a key/value pair Array Iteration Object

Question 4

.every()

Answer 4

Checks if every element in an array pass a test

Question 5

.fill()

Answer 5

Fill the elements in an array with a static value

Question 6

.filter()

Answer 6

Creates a new array with every element in an array that pass a test

Question 7

.find()

Answer 7

Returns the value of the first element in an array that pass a test

Question 8

.findIndex()

Answer 8

Returns the index of the first element in an array that pass a test

Question 9

.forEach()

Answer 9

Calls a function for each array element

Question 10

.from()

Answer 10

Creates an array from an object

Question 11

.includes()

Answer 11

Check if an array contains the specified element

Question 12

.indexOf()

Answer 12

Search the array for an element and returns its position

Question 13

.isArray()

Answer 13

Checks whether an object is an array

Question 14

.join()

Answer 14

Joins all elements of an array into a string

Question 15

.keys()

Answer 15

Returns a Array Iteration Object, containing the keys of the original array

Question 16

.lastIndexOf()

Answer 16

Search the array for an element, starting at the end, and returns its position

Question 17

.map()

Answer 17

Creates a new array with the result of calling a function for each array element

Question 18

.pop()

Answer 18

Removes the last element of an array, and returns that element

Question 19

.push

Answer 19

Adds new elements to the end of an array, and returns the new length

Question 20

.reduce()

Answer 20

Reduce the values of an array to a single value (going left-to-right)

Question 21

.reduceRight()

Answer 21

Reduce the values of an array to a single value (going right-to-left)

Question 22

.reverse()

Answer 22

Reverses the order of the elements in an array

Question 23

.shift()

Answer 23

Removes the first element of an array, and returns that element

Question 24

.slice()

Answer 24

Selects a part of an array, and returns the new array

Question 25

.some()

Answer 25

Checks if any of the elements in an array pass a test

Question 26

.sort()

Answer 26

Sorts the elements of an array

Question 27

.splice

Answer 27

Adds/Removes elements from an array

Question 28

.toString

Answer 28

Converts an array to a string, and returns the result

Question 29

.unshift

Answer 29

Adds new elements to the beginning of an array, and returns the new length

Question 30

.valueOf()

Answer 30

Returns the primitive value of an array