reduce-deep/dist/esm/index.js

Deep reduce an array

import isFlattenable from 'isflattenable';
export default function reduceDeep(array, fn, memo) {
    let result = memo;
    for(let i = 0; i < array.length; i++){
        const value = array[i];
        if (isFlattenable(value)) result = reduceDeep(value, fn, result);
        else result = fn(result, value, array, i);
    }
    return result;
}