nice article

I wanted to add, you can also use reduce for the last example

const originalArray = [4, 6, 8, 10, 8, 12, 6, 45, 8,9,11];
originalArray.reduce((acc,number,index,arr)=>{
  if(number>5) acc.push(number);
  // that way we can exit the reduce
  if(acc.length===3) arr.splice(index+1);

  return acc
},[])

just need to be aware that the arr.splice is actually mutating the original array

we can slice the original array to create a shadow copy and don't mutate the original array, but not sure about the perfomance originalArray.slice().reduce ...