JavaScript Operators
Arithmetic Operators
| Operator |
Description |
Example |
Result |
| + |
Addition
|
x=2
y=2
x+y
|
4
|
| - |
Subtraction
|
x=5
y=2
x-y
|
3 |
| * |
Multiplication
|
x=5
y=4
x*y |
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 equal to (checks for both value and type) |
x=5
y="5"
x==y returns true
x===y 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 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!".
Conditional Operator
JavaScript also contains a conditional operator that assigns a value to a variable based on some condition.
Syntax
variablename=(condition)?value1:value2
|
Example
greeting=(visitor=="PRES")?"Dear President ":"Dear "
|
If the variable visitor is equal to PRES, then put the string "Dear
President " in the variable named greeting. If the variable visitor is not
equal to PRES, then put the string "Dear " into the variable named
greeting.
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