![]() The two options we have is either manually creating a new array (which can be very time-consuming depending upon the size of the sub-array we want to extract) or we could run a for a loop. What is Array slice() in JavaScript?Ĭonsider a case where you want to store the subset of an already existing array in a different array. You can also see that there was no change to the original countries array. As we wanted to extract the subarray between the elements 0 and 3 (including both), we gave the start and end parameters as 0 and 4, respectively (as the end index is not included in the newly created array). To extract Asian countries from this array, we used the slice() method in Javascript. In the example above, initially, we had an array of countries. Let us take a look at an example to understand this better, In case both these values are not specified, the new array will contain all of the values of the original array. Whenever we call the array slice in JavaScript, it is going to return a new array object, which contains the elements from the specified start index to the specified end index (not including the end index). If a negative value is used, then it is treated as taking elements from the end of the array. In case the value is not specified, the length of the array is taken as the default value.
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