Codewars 7 kyu Basic Sequence Practice Javascript

this one uses a lot of methods and such Math.abs() info: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/abs push() info: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/push Math.sign() info: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/sign Array.from() info: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/from Array() constructor info: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/Array triangular number info: https://en.wikipedia.org/wiki/Triangular_number