  TUTORIALS

# JavaScript Operators

= is used to assign values.

+ is used to add values.

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

The arithmetic operator + is used to add values together.

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

The value of x, after the execution of the statements above is 7.

## 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
- Subtraction x=y-2 x=3
* Multiplication x=y*2 x=10
/ Division x=y/2 x=2.5
% Modulus (division remainder) x=y%2 x=1
++ Increment x=++y x=6
-- Decrement x=--y x=4

## 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
= x=y   x=5
+= x+=y x=x+y x=15
-= x-=y x=x-y x=5
*= x*=y x=x*y x=50
/= x/=y x=x/y x=2
%= x%=y x=x%y x=0

## The + Operator Used on Strings

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

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

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

After the execution of the statements above, the variable txt3 contains "What a verynice day".

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

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

or insert a space into the expression:

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

After the execution of the statements above, the variable txt3 contains:

"What a very nice day"

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

## Example

 x=5+5; document.write(x); x="5"+"5"; document.write(x); x=5+"5"; document.write(x); x="5"+5; document.write(x);

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