前端 JS 经典：函数管道

// 将字符串中每一个单词首字母大写
const everyFirstLetterUp = (str) => {
  return str.toLowerCase().replace(/( |^|,)[a-z]/g, (L) => L.toUpperCase());
};
 
// 去除字符串中所有空白字符
const removeEmpty = (str) => {
  return str.replace(/\s+/g, "");
};

let str = "    yqcoder is good";
str = everyFirstLetterUp(str);
str = removeEmpty(str);
console.log(str); // 'YqcoderIsGood'

let str = "    yqcoder is good";
// 管道函数
const pipe = function () {
  let args = Array.from(arguments);
  return function (val) {
    return args.reduce((result, func) => {
      return func(result);
    }, val);
  };
};
 
// 组合函数
const smallCamel = pipe(everyFirstLetterUp, removeEmpty);
smallCamel(str); // 'YqcoderIsGood'