CodingBat isSubsetOf

isSubsetOf

A is said to be a subset of B if, every item in A occurs in B at least as many times as it occurs in A. Define a function that when passed two integer arrays, returns true if the first array is a subset of the second array.

isSubsetOf([20, 10], [10, 70, 20, 90]) → true
isSubsetOf([20, 20], [10, 70, 20, 90]) → false
isSubsetOf([10, 70, 20, 90], [20]) → false

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