JavaScript Arrays and Objects

Which of the follow statements about Arrays are TRUE? (multiple choice)

• Arrays are a data type

• Arrays can store any data type

• Arrays are zero-indexed

• Arrays can only be used with functions

True or False: you can update the value of an Array element

• True

• False

What does the Array.pop( ) method do?

• Adds an element to the beginning of the Array

• Makes popcorn

• Removes the last element from an array and returns that element.

• creates a whole new array

What is Array Destructuring?

• Destructuring is when we destroy an Array

• Destructuring is a special

  syntax that allows us to “unpack”

  Arrays or objects into a bunch of

  variables

• Destructuring is when we use an Array method

What does the Array.concat( ) Method do?

• Combines two or more Arrays without modifying the existing array, but will

  return a new Array

• Splits up an Array into two pieces

• Reduces the amount of Array items in the Array

• Adds the word "cat" to your Array

True or False: String.split( ) Method will return an Array

• True

• False

What does the Array.forEach( ) Method do?

• Iterates through every item in the array,

  runs a function on each item,

  returns a NEW array with the changed items

• Iterates through every item in the array,

  checks whether at least one element in the array passes a test

• Iterates through every item in the array,

  runs a function on each item,

  but leaves the original array intact

What are Objects in JavaScript?

• Objects in JavaScript are primitive data types

• Objects represent real world objects and are complex data types that can store multiple key-value pairs.

• Objects in JavaScript are not supported in modern browsers.
• Objects are used for styling HTML elements.

True or False: Destructuring can be used on Arrays but NOT on Objects

• True

• False

What is a Nested Object?

• An Object with Arrays inside

• An Array with Objects inside

• An Object with other Objects inside

• A Method