>>8-9
これでどうよ

chain = (obj) => {
　return (f, ...args) => {
　　if (!f) return obj
　　return chain(f(obj, ...args))
　}
}

chain([1, 2, 3, 4, 5])(
　filter, (x) => x % 2)(
　map, (x) =>x * x)(
　sum)()
// => 35