SOURCE

function compose(...funcs) {
    if (funcs.length === 0) {
        return args => args;
    }
    if (funcs.length === 1) {
        return funcs[0];
    }
    return funcs.reduce((a,b)=>{
        return (...args) => a(b(...args));
    });
}

const abcd = compose((c)=>c*10,(a,b)=>(a+b));
console.log(abcd(1,2));


function composePromise(...promises) {
    console.log(promises);
    const init = promises.pop();
    return function(...args) {
        return promises.reverse().reduce((sequence, func)=>{
            return sequence.then(function(result){
                return func.call(null,result)
            })
        }, Promise.resolve(init.apply(null, args)));
    }
}

let pa = () => {
    return new Promise((resolve)=>{
        setTimeout(()=>{
            console.log('pa');
            resolve(1111);
        },1000)
    })
}

let pb = () => {
    return new Promise((resolve)=>{
        setTimeout(()=>{
            console.log('pb');
            resolve(2222);
        },2000)
    })
}

const abc = composePromise(pa,pb);
abc().then(res => { console.log(666) })
abc(12312313);