Arrays and Objects

Choose the correct ways to define an array?

• const newArr = [ ]

• const newArr = ( )

• const newArr = new Array()

• const newArr = { }

Given this array:
const newArray = [1, 2, 3, 4, 5]

What statement would return the value 3 from the array?

• newArray[1]

• newArray[2]

• newArray[3]

• newArray[4]

What method is used to add elements to the end of an array?

• push

• add

• insert

• pop

Bisi wants to loop over all the elements in her array named students, what property of the array can she use to set a condition and end the loop?

• students.size

• students.length

• students.name

• students.lastIndex

Which array method is used to create a new array with the results of calling a provided function on every element?

• filter

• reduce

• map

• forEach

Nkem wants to change 3 to 30 in this array:

const ages = [10, 20, 3, 40, 50]

What statement should he use?

• ages[1] = 30

• ages[2] = 30

• ages[3] = 30

• ages[4] = 30

Which of the following is/are the correct way(s) to define an object?

• const person = { }

• const person = new Object()

• const person = Object.create(null)

• const person = [ ]

To add/update name property in an object called person. Which statement(s) can we use?

• person.name = 'Adamu'

• person.updateName('Adamu)

• person('Name') = 'Adamu'

• person['name'] = 'Adamu'

How do you delete/remove a property named name from an object named person?

• delete person

• delete person.name

• remove person.name

• peson.delete('name')

To iterate over the properties of an object named person, what can we use?

• for...in loop

• for...of loop

• for...properties loop

• for...while loop