piscine-Js/reduce.js at master · nemsstyve/piscine-Js · GitHub

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function fold(arr, func, accumulator = 0) {
    for (let i = 0; i < arr.length; i++) {
        accumulator = (func(accumulator, arr[i]))
    }
    return accumulator
}

function foldRight(arr, func, accumulator = 0) {
    for (let i = arr.length - 1; i >= 0; i--) {
        console.log(arr[i])
        accumulator = (func(accumulator, arr[i]))
    }
    return accumulator
}

function reduce(arr, func, accumulator) {
    if (typeof arr[0] === 'number') {
        accumulator = 0
    } else {
        accumulator = ''
    }
    for (let i = 0; i < arr.length; i++) {
        accumulator = (func(accumulator, arr[i]))
    }
    return accumulator
}

function reduceRight(arr, func, accumulator) {
    if (typeof arr[0] === 'number') {
        accumulator = 0
    } else {
        accumulator = ''
    }
    for (let i = arr.length - 1; i >= 0; i--) {
        console.log(arr[i])
        accumulator = (func(accumulator, arr[i]))
    }
    return accumulator
}