What JavaScript Symbols and Operators Mean and How to Use Them?

What Does This Symbol Mean in JavaScript?

This question and answer section provides a comprehensive list of symbols and their meanings in JavaScript.

Symbols

this - Represents the current object.

var - Declares a variable with a function-scoped scope.

(function(){…})() - Immediately Invoked Function Expression (IIFE), runs a function immediately after its declaration.

someFunction()() - Function that returns another function.

=> - Arrow function syntax, returning the expression that follows it.

|> - Pipeline operator, chaining function calls together.

function, yield, yield - Generator function syntax, yielding values or delegating to other generators.

[…], [ value ], Array() - Array literal notation, creates an array.

{…}, { key: value }, { [key]: value } - Object literal syntax, creates an object.

…${…}… - Template literal syntax, creates a string with embedded expressions.

/…/ - Regular expression literal syntax, matches a pattern in a string.

$ - Dollar sign in regex replace patterns, represents special characters or text.

() - Grouping operator, groups expressions for evaluation.

obj.prop, obj[prop], obj["prop"] - Accesses properties of an object, using dot or bracket notation.

?., ?.[], ?.() - Optional chaining operator, accesses properties of an object only if the object exists.

:: - Bind operator, binds a function to a particular object.

new - Creates a new instance of a class or function.

…iter - Spread syntax, expands an iterable into individual elements.

, -- - Increment or decrement operators, increasing or decreasing a variable by 1.

delete - Deletes a property from an object.

void - Evaluates an expression and discards its value.

, - - Arithmetic operators, adding or subtracting numbers.

|, &, ^, ~ - Bitwise operators, performing bitwise operations on numbers.

% - Remainder operator, returns the remainder of a division.

&&, ||, ! - Logical operators, performing logical operations on values.

?? - Nullish-coalescing operator, returns the left operand if it's not null or undefined, otherwise returns the right operand.

** - Exponentiation operator, raises a number to a power.

==, === - Equality operators, checking for equality of values.

!=, !== - Inequality operators, checking for inequality of values.

<<, >>, >>> - Bit shift operators, shifting bits to the left or right.

…?…:… - Conditional (ternary) operator, evaluating a condition and returning different values based on its truthiness.

= - Assignment operator, assigning a value to a variable.

%= - Remainder assignment operator, assigning the remainder of a division to a variable.

= - Addition assignment operator, adding a value to a variable.

&&=, ||=, ??= - Logical assignment operators, updating a variable based on a logical condition.

<<=, >>=, >>>=, &=, ^=, |= - Bitwise assignment operators, updating a variable bitwise.

{}, [ ] - Destructuring assignment, assigning values to multiple variables.

, - Comma operator, evaluating expressions in sequence and returning the result of the last one.

{…} - Block statement, grouping statements together.

var, let, const - Variable declarations, declaring variables with different scopes.

label: - Label, identifying a statement or block for control flow.

123n - BigInt literal, representing a big integer value.

# - Private class field or private method declaration.

_ - Numeric separator, improving readability of large numbers.

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