Assign values to variables and add them together:
Arithmetic operators are used to perform arithmetic between variables and/or values.
| Operator | Description |
|---|---|
| + | Addition |
| - | Subtraction |
| * | Multiplication |
| / | Division |
| % | Modulus |
| ++ | Increment |
| -- | Decrement |
The addition operator (+) adds a value:
The subtraction operator (-) subtracts a value.
The multiplication operator (*) multiplies a value.
The division operator (/) divides a value.
The modular operator (%) returns division remainder.
The increment operator (++) increments a value.
The decrement operator (--) decrements a value.
Assignment operators are used to assign values to JavaScript variables.
| Operator | Example | Same As |
|---|---|---|
| = | x = y | x = y |
| += | x += y | x = x + y |
| -= | x -= y | x = x - y |
| *= | x *= y | x = x * y |
| /= | x /= y | x = x / y |
| %= | x %= y | x = x % y |
The = assignment operator assigns a value to a variable.
The += assignment operator adds a value to a variable.
The -= assignment operator subtracts a value from a variable.
The *= assignment operator multiplies a variable.
The /= assignment divides a variable.
The %= assignment operator assigns a remainder to a variable.
The + operator can also be used to concatenate (add) strings.
 |
When used on strings, the + operator is called the concatenation operator. |
|---|
To add two or more string variables together, use the + operator.
The result of txt3 will be:
To add a space between the two strings, insert a space into one of the strings:
The result of txt3 will be:
or insert a space into the expression:
The result of txt3 will be:
The += operator can also be used to concatenate strings:
The result of txt1 will be:
Adding two numbers, will return the sum, but adding a number and a string will return a string:
The result of x, y, and z will be:
The rule is: If you add a number and a string, the result will be a string!
Comparison and logical operators are described in the JS Comparisons chapter.
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