Unlike the slice() method, the splice() method will change the contents of the original array. const cities = Ĭonst newCityArr = cities.slice(2,4) How to use the splice() JavaScript array method The new returned array will only include the cities at index 2 and 3 because the end position is not included in the extracted elements. In this example, we have specified a start index of 2 and end index of 4. The end position will not be included in the extracted elements for the new array. If an end position is specified, then the slice() method will extract elements from the start position up to the end position. const newCityArr = cities.slice(5) How to use the slice() JavaScript method using the start and end parameters If the start parameter is greater than the last index of the array, then an empty array will be returned. In this example, we will set the start position at -2 which will select the last two cities in the array and return them in a new array. You can also use negative indexes which will start extracting elements from the end of the array. The original array was not modified as we can see here in this example. In this example, we will set the start position at index 2 which will select the last three cities in the array and return them in a new array. It is important to remember that arrays are zero based indexed. You can use the optional start parameter to set a starting position for selecting elements from the array. How to use the slice() JavaScript method using the start parameter When I console.log the result, then I will see all of the elements from my cities array copied into this new array.
I can use the slice() method to create a shallow copy of that array. In this first example, I have created a list of cities from around the world. How to use the slice() JavaScript method without the start and end parameters
Let's take a look at some examples to better understand how the slice() method works. Here is the basic syntax: slice(optional start parameter, optional end parameter) It is important to note that the slice() method does not alter the original array but instead creates a shallow copy. The slice() method can be used to create a copy of an array or return a portion of an array. How to use the slice() JavaScript array method In this article, I will walk you through how to use the slice() and splice() array methods using code examples. When you are first learning JavaScript, it might be difficult to know the difference between the slice() and splice() array methods.
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