Reference: JavaScript Expressions, Keywords, Statements, Syntax & Operators

Primary Expressions

Basic keywords and general expressions in JavaScript take the highest precedence, even that of operators.

Literals

• null
• true or false (Boolean)
• 1234 (Number or BigInt for larger integers)
• string (Template literal syntax, using backticks)

Keywords

Special

• this
• super

Regular Expression

• /regex/

Initializers

• []
• {}

Operators

• () (Grouping)
• ?. (Optional chaining)
• new
• , (Comma allows multiple expression evaluation, returning the result of the last expression)

Increment & Decrement

• A++
• A--
• ++A
• --A

Unary

• delete
• void
• typeof
• +
• -
• ~
• !
• await

Arithmetic

• ** (Exponentiation)
• *
• /
• %
• +
• -

Relational

• <
• >
• <=
• >=
• instanceof
• in

Equality

• ==
• !=
• ===
• !==

Bitwise shift

• <<
• >>
• >>>

Binary bitwise

• &
• |
• ^

Binary logical

• &&
• ||
• ??

Conditional (Ternary)

• (condition ? ifTrue : ifFalse)

Assignment

Destructuring assignment - JavaScript | MDN

• =
• *=
• /=
• %=
• -=
• <<=
• >>=
• >>>=
• &=
• ^=
• |=
• **=
• &&=
• ||=
• ??=

Yield

• yield
• yield*

Notation

=> (arrow functions)

Numbers

• Decimal literals can start with 0 followed by another decimal digit. If all digits after the leading 0 are smaller than 8, the number is interpreted as an octal. To define octal values, use the prefix 0o (e.g., 0o71), similar to 0x for hexadecimal and 0b for binary.
• BigInt literals cannot start with 0 to avoid confusion with legacy octal literals.
• Octal literals always use 0o, followed by digits (e.g., 0o777). For octal BigInts, use 0o followed by digits and n (e.g., 0o123n).

Statements & Declarations

• empty - JavaScript | MDN

Statements

• break
• continue
• debugger
• do...while
• for
• for await...of
• for...in
• for...of
• if...else
• someLabel:
• return
• switch
• throw
• try...catch
• var
• while

Declarations

• export
• function
• function*
• async function
• async function*
• class
• const
• let

Syntax

• Spread syntax (…) - JavaScript | MDN
• import()

Other

• new.target - JavaScript | MDN
• import.meta - JavaScript | MDN