lasourcing.blogg.se - Array slice in javascript

The splice() method is used to remove or replace existing elements in the array. So in case, the object changes you will be able to see the changes on both the original array and the new array. The new array and the original array will refer to the object. In this case, returns the last 3 elements.Ĭase 5: when the end is greater than the index range then it extracts it till the arr.lengthĬase 6: Here it returns the third element from the second to last element.įor objects, the slice always copies object references into a new array. So all elements will be returned starting from the mentioned index(In this case, index 2)Ĭase 3: when the start is greater than the index range, it returns an empty array.Ĭase 4: when passing negative index. Examples of sliceĬase 1: we are passing both the parameters start and end and the returned array includes indexes 1, 2, and 3.Ĭase 2: we are passing only one parameter, omitting the end. Let us see examples of all these cases to have a better understanding. If the end is greater than the index range then it extracts it till the arr.length. If the end is undefined then it extracts the whole array from the starting index number.

This index is not included in the extraction.

end: end is the index at which we want to stop the extraction.

For eg slice(-2) returns the last two elements. If the start is undefined then it starts extracting from zero.Īnd if the start is greater than the index range, it returns an empty array.Ī negative index can also be used for it.

start: Here start is the index number from where you want to extract the array and it is optional.

Here is the syntax of the method: slice() It does not modify the original array rather returns a new array. The slice() method is used to return a new array containing a portion of that array. So, in this blog, we will be understanding both the methods and what is the difference between them.

Out of which slice and splice are mostly used and sometimes people get confused between the two. We have multiple methods to work on arrays. As we know, arrays in Javascript are variables that are capable of holding multiple values.