函数式编程之函数组合pipe

   

function pipe(...fns) {
  const fns_length = fns.length
  return (...vals) => {
    let i = 1
    let result = fns[0].apply(null, vals)
    while(i < fns_length) result = fns[i++](result); 
    return result
  }
}
function log(val) {
  console.log(val)
  return val 
}
function addOne(val) {  
  log(val + 1)
  return val + 1
}

let result = pipe(log, addOne, addOne)(5) // 5 6 7
console.log(result)  // 7 

 实现了从右到左的数据流

    详细信息