implementations of some string stuff

shout.js

(function() {
  function compose(...funcs) {
    return function (value) {
      return funcs.reverse().reduce(function(previous, current) {
        return previous.call(this, current(value));
      });
    };
  }
  
  function shout(string) {
    return `${string}!`;
  }
  function upperCase(string) {
    return string.toUpperCase();
  }
  
  let composed = compose(upperCase, shout);
  
  console.log(composed('hi'));
})();

////////////////////////////////////////////////

class stringShouter {
  constructor(string) {
    this.string = string;
  }
  
  shout() {
    this.string = `${this.string}!`;
    return this;
  }
  
  upperCase() {
    this.string = this.string.toUpperCase();
    return this;
  }
  
  getvalue() {
    return this.string;
  }
}

let shoutIt = new stringShouter('hi');
console.log(shoutIt.upperCase().shout().getvalue());

////////////////////////////////////////////////

let objStringShouter = function(string) {

  return {
    shout() {
      string = `${string}!`;
      return this;
    },
    upperCase() {
      string = string.toUpperCase();
      return this;
    },
    value() {
      return string;
    }
 };
};

let objShoutIt = objStringShouter('hi');

console.log(objShoutIt.upperCase().shout().value());

////////////////////////////////////////////////

function Shouter(string) {
  this.string = string;
  
  this.shout = function() {
    this.string = `${this.string}!`;
    return this;
  }
  
  this.upperCase = function() {
    this.string = this.string.toUpperCase();
    return this;
  }
  
  this.getvalue = function() {
    return this.string;
  }
}

var shoutHi = new Shouter('hi');
console.log(shoutHi.upperCase().shout().getvalue());

////////////////////////////////////////////////

var ObjectShout = {
  shout() {
    this.string = `${this.string}!`;
    return this;
  },
  upperCase() {
    this.string = this.string.toUpperCase();
    return this;
  },
  value() {
    return this.string;
  }
}

var Shouting = Object.create(ObjectShout);
Shouting.string = "hi";
console.log(Shouting.upperCase().shout().value());