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Get largest number from each sub-arrays

Return an array consisting of the largest number from each provided sub-array. 
<script>
console.log(largestArrayNum([[17, 23, 25, 12], [25, 7, 34, 48]]));     //[25, 48]
console.log(largestArrayNum([[13, 27, 18, 26], [4, 5, 1, 3], [32, 35, 37, 39], [1000, 1001, 857, 1]])); // [27, 5, 39, 1001]
console.log(largestArrayNum([[32, 35, 37, 39], [1000, 1001, 857, 1], [13, 35, 18, 26]]));  // [39, 1001, 35]

function largestArrayNum(arr) {
  return arr.map(Function.apply.bind(Math.max, null));
}
</script>
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