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. This value is optional, so it isn't necessary to specify it.Note that this end index will not be included, and hence the element before this index will be the last one in the new array. This indicates the ending index to which elements from the array will be included in the new array object.In case the value is not specified, 0 is taken as the default value. Note that this start index will be included and will be the first one in the new array. This indicates the starting index from where the new array object will be created.There can be at most two parameters in the function slice in Javascript. Let us discuss in detail what each of these means and does. The function slice in javascript either accepts no parameter, one parameter, or two parameters. This will include the elements starting from the start index (including start) till the index end (the element at the end index will not be included) of the array ar and store all these in a new array in br.
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