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linearIn  challenge

Last Modified: 2016-08-20

I am working on below challenge

Array-3 > linearIn
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Given two arrays of ints sorted in increasing order, outer and inner, return true if all of the numbers in inner appear in outer. The best solution makes only a single "linear" pass of both arrays, taking advantage of the fact that both arrays are already in sorted order.

linearIn([1, 2, 4, 6], [2, 4]) → true
linearIn([1, 2, 4, 6], [2, 3, 4]) → false
linearIn([1, 2, 4, 4, 6], [2, 4]) → true

how to verify one array has one other target array or not? is there is built in method for that?
please advise
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