JavaScript Class
Operators
Operators are used to operate on values.
Arithmetic Operators
| Operator | Description | Example | Result |
|---|---|---|---|
| + | Addition | x=2 x+2 |
4 |
| - | Subtraction | x=2 5-x |
3 |
| * | Multiplication | x=4 x*5 |
20 |
| / | Division | 15/5 5/2 |
3 2.5 |
| % | Modulus (division remainder) | 5%2 10%8 10%2 |
1 2 0 |
| ++ | Increment | x=5 x++ |
x=6 |
| -- | Decrement | x=5 x-- |
x=4 |
Assignment Operators
| Operator | Example | Is The 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 |
Comparison Operators
| Operator | Description | Example |
|---|---|---|
| == | is equal to | 5==8 returns false |
| != | is not equal | 5!=8 returns true |
| > | is greater than | 5>8 returns false |
| < | is less than | 5<8 returns true |
| >= | is greater than or equal to | 5>=8 returns false |
| <= | is less than or equal to | 5<=8 returns true |
Logical Operators
| Operator | Description | Example |
|---|---|---|
| && | and | x=6 y=3 (x < 10 && y > 1) returns true |
| || | or | x=6 y=3 (x==5 || y==5) returns false |
| ! | not | x=6 y=3 x != y returns true |
String Operator
A string is most often a text, for example "Hello World!". To stick two or more string variables together, use the + operator.
txt1="What a very" txt2="nice day!" txt3=txt1+txt2 |
The variable txt3 now contains "What a verynice day!".
To add a space between two string variables, insert a space into the expression, OR in one of the strings.
txt1="What a very" txt2="nice day!" txt3=txt1+" "+txt2 or txt1="What a very " txt2="nice day!" txt3=txt1+txt2 |
The variable txt3 now contains "What a very nice day!".