Basic keywords and general expression in JS. These expression have the highest precedence (higher than operators).

this

The this keyword refers to a special property of an execution context.

Literals

Basic null , boolean, number, and string literals.

[]

Array initializer/literal syntax.

{}

Object initializer/literal syntax.

function

defines a function expression.

class

defines a class expression.

function*

defines a generator function expression.

async function

defines an async function expression.

async function*

defines an async generator function expression.

/ab+c/i

RegExp => Regular Expression

`string`

template literal syntax (``)

( )

grouping operator

Left values are the destination of an assignment.

Property accessors

member operators provide access to a property or method of an object ( object.property and object["property"] ).

?.

optimal chaining operator returns undefined instead of causing an error if a reference is nullish .

const adventurer = {
    name: 'Alice',
    cat: {
        name: 'Bob',
    },
};

const dogName = adventurer.dog?.name;
console.log(dogName);

new

creates an instance of a constructor.

new.target

In constructors, new.target refers to the constructor that was invoked by new .

import.meta

an object exposing context-specific metadata to a JS module.

super

the super keyword calls the parent constructor or allows accessing properties of the parent object.

import

the import() syntax allows loading a module asynchronously and dynamically into a potentially non-module environment.

Postfix/prefix increment and postfix/prefix decrement.

A++

Postfix increment operator

++A

Prefix increment operator

--A

Prefix decrement operator

A--

Postfix decrement operator

A unary operation is an operation with only one operand.

delete

deletes a property from an object.

void

evaluates an expression and discards its return value.

typeof

determines the type of a given object.

+

the unary plus operator converts its operand to Number type.

-

the unary negation operator converts its operand to Number type and then negates it.

~

Bitwise NOT operator.

!

Logical NOT operator.

await

pause and resume an async function and wait for the promise' fulfillment/rejection.

Take numerical values (either literals or variables) as their operands and return a single numerical value.

**

the exponential (**) operator returns the result of raising the first operand to the power of the second operand. It is equivalent to Math.pow(), except it also accepts BigInts as operands.

*

multiplication operator

/

division operator

%

remainder operator

+

addition operato

-

subtraction operator

A comparison operator compares its operands and returns a boolean value based on whether the comparison is true.

< (less than)

Less than operator

> (greater than)

Greater than operator

<=

Less than or equal operator

>=

Greater than or equal operator

instanceof

The instanceof operator determines whether an object is an instance of another object.

in

The in operator determines whether an object has a given property.

The result of evaluating an equality operator is always of type boolean based on whether the comparison is true.

==

Equality operator

!=

Inequality operator

===

Strict equality operator

!==

Strict inequality operator

Operations to shift all bits of the operand.

<<

Bitwise left shift operator

>>

Bitwise right shift operator

>>>

Bitwise unsigned right shift operator

Bitwise operators treat their operands as a set of 32 bits (zeros and ones) and return standard JavaScript numerical values.

&

Bitwise AND

|

Bitwise OR

^

Bitwise XOR

Logical operators implement boolean (logical) values and have short-circuiting behavior.

&&

Logical AND

||

Logical OR

??

Nullish coalescing operator

(condition ? ifTrue : ifFalse)

the conditional operator returns one of two values based on the logical value of the condition.

An assignment operator assigns a value to its left operand based on the value of its right operand.

=

Assignment operator

*=

Multiplication assignment

/=

Division assignment

%=

Remainder assignment

+=

Addition assignment

-=

Subtraction assignment

<<=

Left shift assignment

>>=

Right shift assignment

>>>=

Unsigned right shift assignment

&=

Bitwise AND assignment

^=

Bitwise XOR assignment

|=

Bitwise OR assignment

**=

Exponentiation assignment

&&=

Logical AND assignment

||=

Logical OR assignment

??=

Nullish coalescing assignment

[a, b] = arr, {a, b} = obj

Destructuring assignment allows you to assign the properties of an array or object to variables using syntax that looks similar to array or object literals.

yield

Pause and resume a generator function.

yield*

Delegate to another generator function or iterable object.

...obj

Spread syntax allows an iterable, such as an array or string, to be expanded in places where zero or more arguments (for function calls) or elements (for array literals) are expected. In an object literal, the spread syntax enumerates the properties of an object and adds the key-value pairs to the object being created.

,

The comma operator allows multiple expressions to be evaluated in a single statement and returns the result of the last expression.