What are the important JavaScript array methods? arrays are great and very unique in JavaScript. There are many useful in-built properties and methods that assist individuals to complete any task in which arrays are involved. The following are the popular JavaScript array methods:
some ()
Some () tests whether at least one element in the array passes the callback function test. The callback function takes 3 arguments, an element, an index, and a full array. It is also possible to set this value when performing a callback with the this Arg argument.
every ()
The every () method is not very different from the some () method, but this one tests whether all the elements in the array pass the tests performed by a callback function.
reduce ()
The Reduce () method performs the callback function only one time for each value specified in the array and it takes 4 arguments listed below:
accumulator
currentValue
currentIndex
array
When the callback is first called, accumulator and currentValue can be initialValue ​​if per adventure it is specified, and the first value ​​in an array is not given.
map ()
The map () method creates a new array filled with the result of the callback function for each
element in the array. Like any other method, the callback function accepts 3 arguments, a current value, an index, and an array. As in the case of reducing (), the callback is only called for the array index that has a set value (including undefined).
flat ()
The flat () method creates a new array with all elements of the subarray recursively linked to the specified depth. It will be level 1 by default.
filter ()
The filter method, along with a map () is definitely one of the people’s favorites. The filter () method creates a new array together with other elements that successfully pass the test implemented by the callback function.
forEach ()
This method performs only once, the function that is provided for each element in the array.
There are 2 important considerations when using forEach ()
There is no way of stopping or breaking the forEach () loop apart from throwing an exception.
forEach () expects a synchronous callback and does not wait for the promise to be resolved.
findIndex ()
The findIndex () is the method that enables the return of the index of the first element in the array which satisfies the callback function that is provided. -1 is returned, indicating that there has not been an element that has passed the test. Unlike other methods, findIndex () performs a callback function even for indexes with unassigned values.
find ()
The find () method is not very different from the findIndex () method, except it returns the value of the first element that satisfies the provided callback function, possibly for its index. If none of the elements satisfy the callback, undefined is returned.
sort ()
The sort () function is very generic and allows us to sort array elements in their place and return the sorted array. The initial sort order ascends. The complexity and performance of this method cannot be guaranteed as it depends on its performance.
The sort () function modifies an existing array and returns a reference to the same array so that the original and returned arrays are the same.
concat ()
The concat () method is used when combining two or more arrays into one new array.
fill ()
The fill () method converts all elements in the array to static values, from the initial index (default 0) to the final index (default array length). Updates happen instantly and return links to the same array.
includes ()
The includes () method determines whether the array contains a specified value in its record and returns true or false. Note that the includes () method is case-sensitive when comparing strings and characters.
reverse ()
The reverse () method changes the array in its place. By reserve, it means the function transposes the elements of the array, the first element being the last and the last being the first element. This operation modifies the original array and returns a reference to it.
flatMap ()
The flatMap () method applies a function to each array element and then aligns the result in the array. It merges both flat () and map () into a single function.
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