JS - My own version of array.reduce - based on a video by MPJ (FunFunFunction)

my-reducer.js

const numbers = [1, 2, 3]
const result = numbers.reduce((acc, cur) => acc += cur, 0)

result //?

const summr = (total, addition) => total + addition

const myReducer = (reducerFunc, initialValue, arr) => {
  let accumilation = initialValue

  for (let i = 0; i < arr.length; i++) {
    accumilation = reducerFunc(accumilation, arr[i])
  }

  return accumilation
}

const test = myReducer(summr, 0, numbers)

test //?

const summrTest = summr(10, 2) //?