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slice method in JavaScript

This video explains slice method in JavaScript. The slice() method is used to extract portion of an array into new array object. The new array is the shallow copy of the source array. The slice() method takes two optional parameters, startIndex and endIndex. If startIndex is undefined, slice begins with 0 index. If startIndex is more than length of the source array then empty array is returned. startIndex could be a negative value also, in that case slice starts from offset of the end of the source array. If endIndex is undefined, more than the length of the array, or not provided, slice returns items upto the length of the source array. If array contains an object then change in target array would reflect in the source array also.