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Returns the largest number in each sub array
function largestOfFour(arr) {
var results = [];
for (var n in arr) {
var largestNumber = 0;
for (var sb in arr[n]) {
if (arr[n][sb] > largestNumber) {
largestNumber = arr[n][sb];
}
}
results[n] = largestNumber;
}
return results;
}
largestOfFour([[4, 5, 1, 3], [13, 27, 18, 26], [32, 35, 37, 39], [1000, 1001, 857, 1]]);
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