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function reduce (array, callback, initial) {
let accumulator = initial
for (let index = 0; index < array.length; index++) {
const currentValue = array[index]
accumulator = callback(accumulator, currentValue, index, array)
}
return accumulator
}
const result = reduce([1, 2, 3, 4, 5], (acc, cur) => acc + cur, 0)
console.log(result)
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