In computer programming, array slicing is an operation that extracts a subset of elements from an array and packages them as another array, possibly in a different dimension from the original.Ĭommon examples of array slicing are extracting a substring from a string of characters, the ' ell' in 'h ello', extracting a row or column from a two-dimensional array, or extracting a vector from a matrix.ĭepending on the programming language, an array slice can be made out of non-consecutive elements. For other uses of slicing, see Slicing (disambiguation). We can cover all situations by creating a function that takes two arguments: array and index that you can set anew every time you have a different combination of fruits.This article is about the data structure operation. Let's imagine that we can have different fruits, or different number of fruits, or our savoury fruit may be at a different position. For this, we need to exclude the avocado fruit by slicing the array twice, taking the parts before and after it. For instance, we can create a new array with only sweet fruits inside it. You can create functions that apply more than one method to the data. Let's look how we can write a more advanced code with slice. Trim array (remove a few elements at the beginning and/or end of it).Create a copy of an array (by dropping both start and end parameters).The basic use cases for the slice method in JavaScript are: In this case, slice will take the entire array. However, it is possible to drop both parameters at the same time. If at least one parameter is defined, slice will always treat it as start. end will take the element before the element you specified as the end.start will take the element you specified as the start.It means that the very first element in the array has the index 0 and the second one has the index 1. There are a few rules you need to remember about the start and end parameters.Īrrays are indexed: every element has an index which can be used to refer to it.

Using a few practical examples, let's take a closer look at the slice method in JavaScript. The slicing conditions can be set as start and end parameters.It leaves the original array untouched.The slice method creates a copy of an array or a part of it based on specified conditions.

With just this one array, you can create a web page that can change its content ad hoc showing all names or only some of them, for instance, when the user applies a filter. In this example, fruits is an array of simple items which are strings.

Array slice in javascript