Sum of a sequence

[RazvanBugoi]

https://www.codewars.com/kata/586f6741c66d18c22800010a/train/javascript

[RazvanBugoi]

const sequenceSum = (begin, end, step) => {
 let output = 0;
 if (begin > end) return 0; 
    for (let i=begin; i<=end; i+=step) {
      output += i;
}
  return output;
};