Basic operator

Sample code

var a = 10, b = 20;

Addition operations
console.log(30 === a + b);
Subtraction
console.log(-10 === a - b);
Multiplication
console.log(200 === a * b);
Division operations
console.log(0.5 === a / b);
The remainder operation
console.log(10 === a % b);

var a = '.w' , b = 'xs';

String stitching
console.log('.wxs' === a + b);

Unary operators

Sample code

var a = 10, b = 20;

Auto-increment operations
console.log(10 === a++);
console.log(12 === ++a);
Decrement operation
console.log(12 === a--);
console.log(10 === --a);
Positive value operations
console.log(10 === +a);
Negative value operations
console.log(0-10 === -a);
No operation
console.log(-11 === ~a);
Take the inverse operation
console.log(false === !a);
Delete operation
console.log(true === delete a.fake);
Void operation
console.log(undefined === void a);
Typeof operation
console.log("number" === typeof a);

bitwise operator

Sample code

var a = 10, b = 20;

Shift left operation
console.log(80 === (a << 3));
The signed right shift operation
console.log(2 === (a >> 2));
Unsigned right shift operation
console.log(2 === (a >>> 2));
and operations
console.log(2 === (a & 3));
XOR operations
console.log(9 === (a ^ 3));
or operations
console.log(11 === (a | 3));

Comparison operators

Sample code

var a = 10, b = 20;

Less than
console.log(true === (a < b));
Greater than
console.log(false === (a > b));
Less than or equal to
console.log(true === (a <= b));
Greater than or equal to
console.log(false === (a >= b));

Equal value operator

Sample code

var a = 10, b = 20;

equal sign
console.log(false === (a == b));
Non-equal sign
console.log(true === (a != b));
Full equal sign
console.log(false === (a === b));
Non-full equal sign
console.log(true === (a !== b));

Assignment operator

Sample code

var a = 10;

a = 10; a *= 10;
console.log(100 === a);
a = 10; a /= 5;
console.log(2 === a);
a = 10; a %= 7;
console.log(3 === a);
a = 10; a += 5;
console.log(15 === a);
a = 10; a -= 11;
console.log(-1 === a);
a = 10; a <<= 10;
console.log(10240 === a);
a = 10; a >>= 2;
console.log(2 === a);
a = 10; a >>>= 2;
console.log(2 === a);
a = 10; a &= 3;
console.log(2 === a);
a = 10; a ^= 3;
console.log(9 === a);
a = 10; a |= 3;
console.log(11 === a);

Binary logical operators

Sample code

var a = 10, b = 20;

Logically
console.log(20 === (a && b));
Logical or
console.log(10 === (a || b));

Other operators

Sample code

var a = 10, b = 20;

Conditional operators
console.log(20 === (a >= 10 ? a + 10 : b + 10));
Comma operator
console.log(20 === (a, b));

Operator precedence

Priority	Operator	Description	Binding
20	( ... )	Parentheses	n/a
19	... . ...	Members access the	From left to right
... [ ... ]	Members access the	From left to right
... ( ... )	The function call	From left to right
17	... ++	Post-increment	n/a
... --	Post-decreasing	n/a
16	! ...	Logical non-	Right-to-left
~ ...	Bitwise non-	Right-to-left
+ ...	Unary addition	Right-to-left
- ...	Unary subtraction	Right-to-left
++ ...	Precursion	Right-to-left
-- ...	Prepends decrement	Right-to-left
typeof ...	typeof	Right-to-left
void ...	void	Right-to-left
delete ...	delete	Right-to-left
14	... * ...	Multiply	From left to right
... / ...	Division	From left to right
... % ...	Take the mold	From left to right
13	... + ...	Addition	From left to right
... - ...	Subtraction	From left to right
12	... << ...	Shift left by bit	From left to right
... >> ...	Shift right by bit	From left to right
... >>> ...	Unsigned to move right	From left to right
11	... < ...	Less than	From left to right
... <= ...	Less than or equal to	From left to right
... > ...	Greater than	From left to right
... >= ...	Greater than or equal to	From left to right
10	... == ...	The equal sign	From left to right
... ! = ...	Non-equal sign	From left to right
... === ...	Full equal sign	From left to right
... ! == ...	Not a full equal sign	From left to right
9	... & ...	Bitwise and	From left to right
8	... ^ ...	By bit or	From left to right
7	... ｜ ...	Bitwise or	From left to right
6	... && ...	Logic and	From left to right
5	... ｜｜ ...	Logical or	From left to right
4	... ? ... : ...	Conditional operator	Right-to-left
3	... = ...	Assign a value	Right-to-left
... += ...	Assign a value	Right-to-left
... -= ...	Assign a value	Right-to-left
... *= ...	Assign a value	Right-to-left
... /= ...	Assign a value	Right-to-left
... %= ...	Assign a value	Right-to-left
... <<= ...	Assign a value	Right-to-left
... >>= ...	Assign a value	Right-to-left
... >>>= ...	Assign a value	Right-to-left
... &= ...	Assign a value	Right-to-left
... ^= ...	Assign a value	Right-to-left
... ｜= ...	Assign a value	Right-to-left
0	... , ...	Comma	From left to right