Sum All Numbers in a Range-[insight]

JavaScript
1

Tell us what’s happening:
Step1: I first sort the array to fetch the min(1st elem) and the max(last elem) of the array
Step2: I then traverse through the 1st and the Last(min & max) to get all the numbers pushed to a new array
Step3: perform a reduce method to get the sum of all the elements in the new array.

Can I consider this as the good method for solving this problem?

Your code so far

function sumAll(arr) {
  arr.sort(function(a,b){
    return a-b;
  });
  arr1=[];
  for(var i=arr[0];i<=arr[arr.length-1];i++){
    arr1.push(i);
  }
  
  return arr1.reduce(function(prev,curr){
    return prev+curr;
  });
}

sumAll([1, 4]);

Your browser information:

Your Browser User Agent is: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.94 Safari/537.36.

Link to the challenge:

2

Your logic is nice and clear, and is a good approach. If there’s one thing I’d point out (though not logic-related), the arr1 variable should have been declared with const or var keyword (i.e., const arr1 = [];). This makes sure that the variable is declared in the scope of the function, not the global scope.