Variables in JavaScript. 5A

A variable in JavaScript is a named storage unit that can be used to store data like strings, numbers, boolean values, objects, arrays, and more. Variables are created with the keyword var followed by the name of the variable and an optional value (which can be changed later). For example:

var myName = “John”;

To initialize a variable in most programming languages, you must first declare the variable and then assign it a value. For example, in JavaScript, you could declare an integer variable called “myNum” and assign it the value of 10:

var myNum = 10;

1. Variable names must begin with a letter, $, or _.
2. Variable names cannot contain spaces or special characters such as !, @, #, %, etc.
3. Variable names cannot contain reserved keywords such as if, else, while, switch, etc.
4. Variable names should be descriptive and must be easy to read.
5. Variable names are case sensitive in most languages.

The arithmetic operators in JavaScript are:

Addition (+) – The addition operator adds two values together.

Subtraction (-) – The subtraction operator subtracts two values.

Multiplication (*) – The multiplication operator multiplies two values together.

Division (/) – The division operator divides two values.

Exponentiation (**) – The exponentiation operator raises a number to a power.

Modulus (%) – The modulus operator returns the remainder of an integer division.

Increment (++) – The increment operator increases an integer value by one.

The line of code used to prompt a user for a response is: prompt(“Please enter a response”);