JavaScript Cheat Sheet

JavaScript Arrays

concat() Join several arrays into one

copyWithin() Copy array elements within the array,

to and from specified positions

indexOf() Return the primitive value of the

specified object

includes() Check if an array contains the

specified element

join() Combine elements of an array into a

single string and return the string

entries() Return a key/value pair Array Iteration

Object

every() Check if every element in an array

passes a test

fill() Fill the elements in an array with a

static value

filter() Create a new array with every

element in an array that pass a test

find() Return the value of the first element

in an array that pass a test

forEach() Call a function for each array element

from() Create an array from an object

lastIndexOf() Give the last position at which a given

element appears in an array

pop() Remove the last element of an array

push() Add a new element at the end

reverse() Sort elements in descending order

reduce() Reduce the values of an array to a

single value (going left-to-right)

reduceRight() Reduce the values of an array to a

single value (going right-to-left)

shift() Remove the first element of an array

slice() Pull a copy of a portion of an array into

a new array object

sort() Sort elements alphabetically

splice() Add elements in a specified way and

position

unshift() Add a new element to the beginning

JavaScript Boolean Methods

toString() Convert a Boolean value to a string,

and return the result

valueOf() Return the first position at which a

given element appears in an array

toSource() Return a string representing the

source code of the object

JavaScript Arithmetic Operators

+ Addition

- Subtraction

* Multiplication

/ Division

(...)

Grouping operator (operations within

brackets are executed earlier than

those outside)

% Modulus (remainder)

++ Increment numbers

-- Decrement numbers

== Equal to

=== Equal value and equal type

!= Not equal

!== Not equal value or not equal type

> Greater than

< Lesser than

>= Greater than or equal to

<= Lesser than or equal to

? Ternary operator

Logical Operators

&& Logical AND

|| Logical OR

! Logical NOT

Bitwise Operators

& AND statement

| OR statement

~ NOT

^ XOR

<< Left shift

>> Right shift

>>> Zero fill right shift