JavaScript

Syntax

100

How do you write a single line comment?

//This is a single line comment

200

Multiline Comment symbols

/* *\

300

Is JavaScript case sensitive?

True. So variables like lastName and lastname are not the same. 

400

JavaScript Statements seperated by

semicolons

500

operator that returns the type of a variable or an expression

typeof

Data Types

100

How many values can boolean data hold?

2 - True and False

200

Keyword to declare a variable in JavaScript?

let

300

data type of the following variable?
let x = 7.5

Float

400

What symbol is not allowed for a variable name?

hyphen

500

symbol meaning not identical

!==

Operators/Variables

100

Symbol used for strings

single or double quotes

200

Function to print text in the browser

document.write()

300

Declare a variable and assign its value

let variable name = value;

400

Which of the following best describes a variable?

container for storing data values

500

Which variable cannot be redeclared, reassigned and has a block scope?

const

Output

100

What is the purpose of console?

test code and fix bugs

200

What code is used to displaying output to the console?

console.log("Error!")

300

Correct way to change a picture in JavaScript

document.getElementById('myImage').src='pic_bulbon.gif'"

400

Which of the following functions  will print text in the browser?

document.write()

500

Used to display important in another window

window.alert()

Implementation

100

What is JavaScript?

Scripting language

200

property to change the HTML content of the HTML element

innerHTML

300

What is the output of this code?
//x=8;
x=2;
//x=3;
console.log(x);

2

400

Naming scheme used by most JavaScripters

camelCase

500

Declaration of a external script

<script src="myScript.js"></script>