On: Ask HN: Will front end development ever move away from JavaScript?

[z3t4]

You've got an array, and want to "hypotenuse" it. Your code is fine, as it's pretty clear what it does. But for the sake of refactoring:

  const hypot = arrNum => Math.sqrt(arrNum.reduce((sum,n) => sum + n*n))

  hypot([1,1,3,3,4])

Although I would prefer:

  function hypot(arrNum) {
    for(var i=0, sum=0; i<arrNum.length; i++) sum += arrNum[i] * arrNum[i];
    return Math.sqrt(sum);
  }

[sAbakumoff → z3t4]

I don't think it's a good solution because it performs the operation manually instead of calling the built-in Math.hypot method. This is the point - "apply" is a widely used technique, at least it used to be on pre-ES6 times.