JavaScript provides a variety of built-in array methods that allow you to manipulate arrays in various ways. JavaScript array methods are functions built into the Array object that provide a range of functionalities for working with arrays. These methods make it easier to perform common operations, manipulate elements, and iterate through arrays
Mutating Methods:
push() and pop(): Add and remove elements from the end of an array, respectively.
unshift() and shift(): Add and remove elements from the beginning of an array, respectively.
splice(): Add, remove, or replace elements at any position in an array.
Non-mutating Methods (Create New Arrays):
concat(): Combines two or more arrays to create a new one.
slice(): Creates a shallow copy of a portion of an array.
filter(): Creates a new array with elements that pass a test.
map(): Creates a new array by applying a function to each element.
reduce(): Reduces the array to a single value by applying a function to each element.
Iterative Methods:
forEach(): Executes a provided function once for each array element.
map(): Applies a function to each element and returns a new array of results.
filter(): Creates a new array with elements that pass a test.
some(): Tests if at least one element passes a test.
every(): Tests if all elements pass a test.
reduce(): Applies a function against an accumulator and each element.
Searching and Indexing:
indexOf() and lastIndexOf(): Find the index of the first/last occurrence of an element.
find(): Returns the first element that satisfies a provided function.
findIndex(): Returns the index of the first element that satisfies a provided function.
Testing and Comparison:
some(): Tests if at least one element passes a test.
every(): Tests if all elements pass a test.
Functional Programming (Higher-order Functions):
map(), filter(), reduce(): Commonly used in functional programming paradigms.
Error Handling:
try…catch with forEach(): If an error occurs during the iteration, it can be caught.
ES6 and Beyond:
includes(): Checks if an array includes a certain element.
find(): Returns the first element that satisfies a provided function.
findIndex(): Returns the index of the first element that satisfies a provided function.
Asynchronous Operations:
Promises and Promise.all(): For handling asynchronous operations on arrays.
Chaining:
Methods like map(), filter(), and reduce() are often used in method chaining for concise and expressive code.
