Codewars 7 kyu Adding Values of Arrays in a Shifted Way Javascript

this one uses for loops, the Array() constructor, and the fill() method

kata link: https://www.codewars.com/kata/57c7231c484cf9e6ac000090/javascript
7 kyu playlist link: https://www.youtube.com/playlist?list=PLktFju7xyBzQLDSLGl8gSM1FCSRt6Sh3i

Array() info: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/Array
fill() info: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/fill

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