JavaScript Understanding get second lowest and second highest value in array

The loop in question:

for(var j=1; j < arr_num.length; j++) {  
    if(arr_num[j-1] !== arr_num[j]) {
      uniqa.push(arr_num[j]);  
    }  
  }

Provides some clue as to what it's doing by using a (reasonably) descriptive variable name: uniqa - or "unique array". The if statement is checking that the current element is not the same as the previous element - having sorted the array initially this works to give you a unique array - by only filling a new array if the element is indeed unique.

Thereafter the logic is the same as yours.

Answer:1

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