Feedback on Sum All Numbers in a Range solution

Tell us what’s happening:
So I managed to solve it and then took a look at the solution section and it mentions using math.min an max which I didn’t know about. I guess I’m wondering if I am fine without learning those. Originally I wanted to use recursion like in the fourth solution but I still struggle with understanding the proper way to use it I suppose. Anyway feedback is very much appreciated.

Your code so far

function sumAll(arr) {
  //establishes new Array;
  const newArr = [];
  //sorts the given array from lowest to highest
  const smallFirst = arr.sort((a,b) => a - b);
  //makes a new array with the two values and everything in between
  for (let i = smallFirst[0]; i <= smallFirst[1]; i++){
 //returns the sum all  
 return newArr.reduce((acc,element) => acc + element);

sumAll([10, 5]);

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Challenge: Intermediate Algorithm Scripting - Sum All Numbers in a Range

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