A List of JavaScript Array Methods

In JavaScript, an array is a data structure that contains list of elements which store multiple values in a single variable. The strength of JavaScript arrays lies in the array methods. Array methods are functions built-in to JavaScript that we can apply to our arrays — Each method has a unique function that performs a change or calculation to our array and saves us from writing common functions from scratch.

JavaScript Array Methods

1. map( )

This method creates a new array with the results of calling a provided function on every element in this array.

2. filter( )

This method creates a new array with only elements that passes the condition inside the provided function.

3. sort( )

This method is used to arrange/sort array’s elements either in ascending or descending order.

4. forEach( )

This method helps to loop over array by executing a provided callback function for each element in an array.

5. concat( )

This method is used to merge two or more arrays and returns a new array, without changing the existing arrays.

6. every( )

This method checks every element in the array that passes the condition, returning true or false as appropriate.

7. some( )

This method checks if at least one element in the array that passes the condition, returning true or false as appropriate

8. includes( )

This method checks if an array includes the element that passes the condition, returning true or false as appropriate.

9. join( )

This method returns a new string by concatenating all of the array’s elements separated by the specified separator.

10. reduce( )

This method applies a function against an accumulator and each element in the array to reduce it to a single value.

11. find( )

This method returns the value of the first element in an array that pass the test in a testing function.

12. findIndex( )

This method returns the index of the first element in an array that pass the test in a testing function.

13. indexOf( )

This method returns the index of the first occurrence of the specified element in the array, or -1 if it is not found.

14. fill( )

This method fills the elements in an array with a static value and returns the modified array.

15. slice( )

This method returns a new array with specified start to end elements.

16. reverse( )

This method reverses an array in place. Element at last index will be first and element at 0 index will be last

17. push( )

This method adds one or more elements to the end of array and returns the new length of the array.

18. pop( )

This method removes the last element from the end of array and returns that element.

19. shift( )

This method removes the first element from an array and returns that element.

20. unshift( )

This method adds one or more elements to the beginning of an array and returns the new length of the array.

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