= 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 | |
---|---|---|---|---|
+ | Addition | x=y+2 | x=7 | y=5 |
- | Subtraction | x=y-2 | x=3 | y=5 |
* | Multiplication | x=y*2 | x=10 | y=5 |
/ | Division | x=y/2 | x=2.5 | y=5 |
% | Modulus (division remainder) | x=y%2 | x=1 | y=5 |
++ | Increment | x=++y | x=6 | y=6 |
x=y++ | x=5 | y=6 | ||
-- | Decrement | x=--y | x=4 | y=4 |
x=y-- | x=5 | y=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"
Adding Strings and Numbers
The rule is: If you add a number and a string, the result will be a string!
Example
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