javascript - How does while loop work without a condition?

Question

I understand that it's removing the first 3 elements of the array and adding them to the new array. But how does the function continue to add ensuing chunks of the array to the new array variable?

How does the while loop work without proper conditions?

How does it work in collaboration with splice() here?

function chunkArrayInGroups(arr, size){
  let newArr = [];
  while(arr.length){
    newArr.push(arr.splice(0, size))
  }
  return newArr;
}

chunkArrayInGroups(["a", "b", "c", "d"], 2);

Answer 1

Conditions in js are either "truthy" or "falsy", for numbers everything except 0 is "truthy", 0 is "falsy". That means that the loop runs until the array is empty, its length 0 and therefore falsy.

 if(0) alert("never");
 if(1) alert("always");
 let i = 3;
 while(i) console.log(i--);