组合函数的妙用

rubinTime · 发表于 2022-2-23 13:51:53

//组合函数
let str=" !Innovation distinguishes between a. leader and a follower?? "

//这些函数都是一个输入和一个输出
const trim=str=>str.replace(/^\s*|\s*$/g,'')

const noPunct=str=>str.replace(/[?.,!/g,'')

const capitalize=str=>str.toUpperCase()

const breakout=str=>str.split(" ")

const noArticles=word=>(word!=='A'&&word!=="AN"&&word!=="THE")

const filterArticles=arr=>arr.filter(noArticles)

//正经输出
console.log(filterArticles(breakout(capitalize(noPunct(trim(str))))))

//不正经方法
const compose=(...fns)=>{
return function(x){
   return  fns.reduceRight((prev,func)=>{
      //reduceRight与reduce的区别
      //reduceRight对数组元素的遍历执行是从右到左
      return func(prev)
   },x)
}
}

const pipe=(...fns)=>{
  //pipe的实现和compose没什么不同，只是把reduceRight换成了reduce
  //改变了传参的顺序，符合正常人的逻辑
  return function(x){
   return  fns.reduce((prev,func)=>{
      return func(prev)
   },x)
  }
}
const processArticles=compose(
JSON.stringify,
filterArticles,
breakout,
capitalize,
noPunct,
trim
)
const processArticles1=pipe(
  trim,
  noPunct,
  capitalize,
  breakout,
  filterArticles,
  JSON.stringify
  )

//只想去特殊字符和字母大写
const processArticles2=compose(capitalize,noPunct)
//按空格字符转成数组,去掉"A"
const processArticles3=pipe(breakout,filterArticles)

console.log(processArticles(str)===processArticles1(str))
console.log(processArticles(str),"\n",processArticles2(str),
"\n",processArticles3(str))