My code works for one of the tests but it fails for the second one but I unfortunately cannot figure out why. Any help is greatly appreciated. Thank you.
function largestOfFour(arr) {
var largestNumber=0;
var bigNum=[];
for(var i=0; i<arr.length; i++){
var subArray =arr[i];
for(var j=0; j<subArray.length;j++ ){
if(subArray[j]>largestNumber){
largestNumber=subArray[j];
}
}
bigNum.push(largestNumber);
}
return bigNum;
}
largestOfFour([[13, 27, 18, 26], [4, 5, 1, 3], [32, 35, 37, 39], [1000, 1001, 857, 1]])