JavaScript Operators

= is used to assign values.

+ is used to add values.

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The assignment operator = is used to assign values to JavaScript variables.

The arithmetic operator + is used to add values together.

Example

Assign values to variables and add them together:

y = 5;
z = 2;
x = y + z;

The result of x will be:

7

Try it Yourself »

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JavaScript Arithmetic Operators

Arithmetic operators are used to perform arithmetic between variables and/or values.

Given that y=5, the table below explains the arithmetic operators:

Operator	Description	Example	Result	Result	Try it
+	Addition	x = y + 2	y = 5	x = 7	Try it »
-	Subtraction	x = y - 2	y = 5	x = 3	Try it »
*	Multiplication	x = y * 2	y = 5	x = 10	Try it »
/	Division	x = y / 2	y = 5	x = 2.5	Try it »
%	Modulus (division remainder)	x = y % 2	y = 5	x = 1	Try it »
++	Increment	x = ++y	y = 6	x = 6	Try it »
		x = y++	y = 6	x = 5	Try it »
--	Decrement	x = --y	y = 4	x = 4	Try it »
		x = y--	y = 4	x = 5	Try it »

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JavaScript Assignment Operators

Assignment operators are used to assign values to JavaScript variables.

Given that x=10 and y=5, the table below explains the assignment operators:

Operator	Example	Same As	Result	Try it
=	x = y	x = y	x = 5	Try it »
+=	x += y	x = x + y	x = 15	Try it »
-=	x -= y	x = x - y	x = 5	Try it »
*=	x *= y	x = x * y	x = 50	Try it »
/=	x /= y	x = x / y	x = 2	Try it »
%=	x %= y	x = x % y	x = 0	Try it »

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The + Operator Used on Strings

The + operator can also be used to add string variables or text values together.

Example

To add two or more string variables together, use the + operator.

txt1 = "What a very";
txt2 = "nice day";
txt3 = txt1 + txt2;

The result of txt3 will be:

What a verynice day

Try it Yourself »

To add a space between the two strings, insert a space into one of the strings:

Example

txt1 = "What a very ";
txt2 = "nice day";
txt3 = txt1 + txt2;

The result of txt3 will be:

What a very nice day

Try it Yourself »

or insert a space into the expression:

Example

txt1 = "What a very";
txt2 = "nice day";
txt3 = txt1 + " " + txt2;

The result of txt3 will be:

What a very nice day

Try it Yourself »

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Adding Strings and Numbers

Adding two numbers, will return the sum, but adding a number and a string will return a string:

Example

x = 5 + 5;
y = "5" + 5;
z= "Hello" + 5;

The result of x, y, and z will be:

10
55
Hello5

Try it Yourself »

The rule is: If you add a number and a string, the result will be a string!