# JavaScript Operators

Updated: May 10, 2020

Numeric data in JavaScript is represented by the `Number` data type.

In JavaScript, like in mathematics, the `+` symbol is used as an addition operator when in between two number.

Example:

``var randomNumber = 7 + 10; // 17``

## Subtract One Number from Another

JavaScript uses the `-` symbol for subtraction, in order to subtract one number from another:

``var randomNumber = 10 - 5; // 5``

## Multiply Two Numbers

JavaScript uses the `*` symbol for multiplication of two numbers:

``var randomNumber = 10 * 10; // 100``

## Divide One Number by Another

JavaScript uses the `/` symbol in order to divide one number by another:

``var randomNumber = 100 / 10; // 10``

## Increment a Number

In JavaScript, we can use the `++` operator to increment or add one to a variable:

``i++;``

is the equivalent of

``i = i + 1;``

## Decrement a Number

In JavaScript, we can use the `--` operator to decrement or decrease a variable value by one:

``i--;``

is the equivalent of

``i = i - 1;``

## Create Decimal Numbers

Variables can store also decimal number, which are referred to also as `floating point numbers` or simply `floats`.

``var myDecimal = 9.9;``

## Multiply Two Decimals

Just like with whole numbers, in JavaScript, we can perform calculations also with decimal numbers:

``var product = 2.0 * 2.5; // 5``

## Divide One Decimal by Another

Now let's divide one decimal by another:

``var quotient = 6.6 / 2.0; // 3.3``

## Finding a Remainder

In programming, it's common to check if a number is `even` (divisible by 2) or `odd` (not divisible by 2).

The remainder operator `%` gives the remainder of the division of two numbers:

``17 % 2 = 1; // 17 ==> Odd10 % 2 = 0; // 10 ==> Even``

We can break this down by:

``Math.floor(17 / 2) = 8;8 * 2 = 16;17 - 16 = 1; // Remainder``

## Compound Assignment With Augmented Addition

In programming, we use assignments to modify the content of a variable. Moreover, other than assigning a new value, we saw also how to perform basic mathematical operation.

In JavaScript, we can combine a mathematical operator and the assignment operator and obtain a new operator used for augmented addition `+=`:

``var myFavoriteNumber = 1;myFavoriteNumber += 16;console.log(myFavoriteNumber); // 17``

## Compound Assignment With Augmented Subtraction

Just like the `+=` operator we saw before, `-=` subtracts a number from a variable:

``var myFavoriteNumber = 4;myFavoriteNumber -= 1;console.log(myFavoriteNumber); // 3``

## Compound Assignment With Augmented Multiplication

Using the `*=` operator, we can multiply a variable by a number:

``var myFavoriteNumber = 5;myFavoriteNumber *= 6;console.log(myFavoriteNumber); // 30``

## Compound Assignment With Augmented Division

Using the `/=` operator, we can divide a variable by another number:

``var myFavoriteNumber = 10;myFavoriteNumber /= 2;console.log(myFavoriteNumber); // 5``