pipe&compose.js

function pipe() {
    let funcs = arguments;

    return function() {
        let length = funcs.length;
        let index = 0;
        let result;

        while (index < length) {
            let fn = funcs[index];

            result = index ? fn.call(null, result) : fn.apply(null, arguments)
            index++;
        }

        return result;
    }
}

function compose() {
    return pipe.apply(null, [].reverse.call(arguments))
}