JavaScript Quiz

Object-Oriented

Object-Based

Assembly-language

High-level

To refer to the current object

To declare a variable

To create a loop

To import external libraries

The data type of a variable

The value of a variable

The length of a string

The index of an array element

// This is a comment

/* This is a comment */

# This is a comment

%% This is a comment

To declare a block-scoped variable

To refer to the current object

To create a loop

To import external libraries

Not a Number

Null

Undefined

Infinity

push()

pop()

shift()

unshift()

To iterate over the elements of an array

To add a new element to the end of an array

To remove the first element of an array

To check if an element exists in an array

const myVar = 10;

let myVar = 10;

var myVar = 10;

constant myVar = 10;

Value and type

Value only

Type only

Reference in memory