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iterate SubArray
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iterateSubArray.md

Given a 2-dimensional array, traverse through the array until you encounter a subarray starting with a value 3. Return the sum of all the numbers traversed.

function iterateSubArray(arr){
// write your code here
}
iterateSubArray([[1,2,4],[0,1,1],[],[3,2],[4,9,11]]);//9  (1+2+4+0+1+1)
iterateSubArray([[1,2,4],[0,3,1],[],[5,2]]);//18 
iterateSubArray([[3,2,4],[0,1,1],[],[5,2]]);//0
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