If set to 0(zero), no items will be removed. Splice() method can take n number of arguments:Īrgument 2: Optional. The splice() method changes the original array and slice() method doesn’t change the original array. The slice() method returns the selected element(s) in an array, as a new array object. The splice() method returns the removed items in an array. Returns: An array containing the extracted elements. If end is negative it is treated as "Math.max((array.length + begin),0)" as per spec (example provided below) effectively from the end of array. Last index for extraction but not including (default array.length). If begin is negative it is treated as "Math.max((array.length + begin), 0)" as per spec (example provided below) effectively from the end of array. Remove last element (start -> array.length+start = 3)Ĭonsole.log('Elements deleted:', array.splice(-1, 1), 'mutated array:', array) 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 ('Elements deleted:', array.splice(0, 1), 'mutated array:', array) 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.
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.
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.
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