Chain input/outputs of functions together

function-flow.js

export function flow(...fn) {
    return function (...args) {
        let ret = fn[0].apply(this, args);
        let index = 1;
        let { length } = fn;

        while (index < length) {
            ret = fn.call(this, ret);
            index++;
        }

        return ret;
    };
}

export async function asyncFlow(...fn) {
    return function (...args) {
        let ret = await fn[0].apply(this, args);
        let index = 1;
        let { length } = fn;

        while (index < length) {
            ret = await fn.call(this, ret);
            index++;
        }

        return ret;
    };
}