JavaScript Array Reference
| Name | Description |
|---|---|
[ ] | Creates a new array (array literal syntax). |
new Array() | Creates a new array (constructor syntax). |
at() | Returns an indexed element of an array (supports negative indices). |
concat() | Joins arrays or values and returns a new array. |
constructor | Returns the function that created the Array prototype. |
copyWithin() | Copies array elements within the array to specified positions. |
entries() | Returns an Array Iterator object with key/value pairs. |
every() | Checks if every element in an array passes a test. |
fill() | Fills all or part of an array with a static value. |
filter() | Creates a new array with elements that pass a test. |
find() | Returns the first element that passes a test. |
findIndex() | Returns the index of the first element that passes a test. |
findLast() | Returns the last element that passes a test. |
findLastIndex() | Returns the index of the last element that passes a test. |
flat() | Concatenates sub-array elements into a new array (flatten to depth). |
flatMap() | Maps all array elements and flattens the result by one level. |
forEach() | Calls a function for each array element. |
from() | Creates an array from an array-like or iterable object. |
includes() | Checks if an array contains a specified element. |
indexOf() | Returns the first index of a specified element, or -1. |
isArray() | Checks whether an object is an array. |
join() | Joins all elements into a string with a specified separator. |
keys() | Returns an Array Iterator object with the keys (indices). |
lastIndexOf() | Returns the last index of a specified element, or -1. |
length | Sets or returns the number of elements in an array. |
map() | Creates a new array with results of calling a function on each element. |
of() | Creates an array from a variable number of arguments. |
pop() | Removes the last element of an array and returns it. |
prototype | Allows adding properties and methods to the Array object. |
push() | Adds new elements to the end of an array and returns the new length. |
reduce() | Reduces the array to a single value (left-to-right). |
reduceRight() | Reduces the array to a single value (right-to-left). |
reverse() | Reverses the order of elements in an array. |
shift() | Removes the first element of an array and returns it. |
slice() | Selects a part of an array and returns it as a new array. |
some() | Checks if any element in an array passes a test. |
sort() | Sorts the elements of an array in place. |
splice() | Adds or removes elements from an array. |
toReversed() | Returns a new array with elements in reversed order (ES2023). |
toSorted() | Returns a new array with elements sorted (ES2023). |
toSpliced() | Adds or removes elements at a specified index (ES2023). |
toString() | Converts an array to a comma-separated string. |
unshift() | Adds new elements to the beginning of an array and returns new length. |
valueOf() | Returns the primitive value of an array (same as the array itself). |
values() | Returns an Array Iterator object with the values of the array. |
with() | Returns a new array with an element updated at a specified index. |
| Additional Utilities | |
Math.min(...arr) | Returns the smallest number from an array (spread required). |
Math.max(...arr) | Returns the largest number from an array (spread required). |
Spread (...) | Expands array elements for copying, merging, or passing as arguments. |
Rest (...) | Collects multiple elements into an array (e.g., function parameters). |