Cheatsheet of JavaScript array methods with explanation:

To add/remove elements:

~ push(...items) – adds items to the end,

~ pop() – extracts an item from the end,

~ shift() – extracts an item from the beginning,

~ unshift(...items) – adds items to the beginning.

Thread

~ splice(pos, deleteCount, ...items) – at index pos delete deleteCount elements and insert items.

~ slice(start, end) – creates a new array, copies elements from position start till end (not inclusive) into it.

~ concat(...items) – returns a new array: copies all members of the current one and adds items to it. If any of items is an array, then its elements are taken.

To search among elements:

~ indexOf/lastIndexOf(item, pos) – look for item starting from position pos, return the index or -1if not found.

~ includes(value) – returns true if the array has value, otherwise false.

~ find/filter(func) – filter elements through the function, return first/all values that make it return true.

~ findIndex is like find, but returns the index instead of a value.

To iterate over elements:

~ forEach(func) – calls func for every element, does not return anything.

To transform the array:

~ map(func) – creates a new array from results of calling func for every element.

~ sort(func) – sorts the array in-place, then returns it.

~ reverse() – reverses the array in-place, then returns it.

~ split/join – convert a string to array and back.

~ reduce(func, initial) – calculate a single value over the array by calling func for each element and passing an intermediate result between the calls.

Additionally:

~ Array.isArray(arr) checks arr for being an array.

Please note that methods sort, reverse and splice modify the array itself.

These methods are the most used ones, they cover 99% of use cases. But there are few others: