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Operators

Operators are symbols used to execute certian operations represented by it.

🧮 Arithmetic operators

Consider y = 5

Operator Example Result Description
+ x = y + 2 7 Addition
- x = y - 2 3 Subtraction
* x = y * 2 10 Multiplication
/ x = y / 2 2.5 Division
% x = y % 2 1 Modulo
++ x = ++y 6 Increement
-- x = --y 4 Decreement

🟰 Assignment operators

Consider x = 10 y = 5

Operator Example Result Description
= x = y 5
+= x += y 15 x=x+y
-= x -= y 5 x=x-y
*= x *= y 50 x=x*y
/= x /= y 2 x=x/y
%= x %= y 0 x=x%y

➕ operator logic

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

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

With mixed data types, the + operator causes JavaScript to run through a set sequence of type conversions

IF String is present -> Convert into String and concatenate
IF NOT
IF Object/Array is present -> Convert into primitive
If NOT
Convert into Numeric type and add
If NOT possible to even convert into number
return NaN

Illustraction of + operator

[] + 1 --> "" + 1 --> "" + "1" --> "1"
"Hi" + 1 --> "Hi" + "1" --> "Hi1"
true + false --> 1 + 0 --> 1
true + "1" --> "true" + "1" --> "true1"
true + 1 --> 1 + 1 --> 2
null + 1 --> 0 + 1 --> 1
undefined + 1 --> NaN

Note

Other arithmetic operators try to convert all other types into numeric. Ex: "5" - 5 --> 0

⚖️Comparison operators

Operator Description Example Result
== equal to true == 1 true
=== exactly equal to true === 1 false
!= not equal to true != 1 false
< Less than 1 < 3 true
> Greater than 4 > 5 false
<= Less than or equal to 1 <= 1 true
>= Greater than or equal to 10 >= 20 false

🧠 Logical operators

Operator Description Example
AND && True if all conditions are true (x == 3)&&(y > 0)
OR || True if any one of all conditions is true (x == 3)||(y > 0)
NOT ! Toggles the condition result !(x == 3)

❓Conditional operator

Syntax:
variable = condition ? value_if_true : value_if_false

Example

isAdult = (age >= 18) ? "Yes" : "No" ;

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