JSFiddle - React, Tailwind, and code Playground

JavaScript

function doubleSay (str) {
  return str + ", " + str;
}
function capitalize (str) {
  return str[0].toUpperCase() + str.substring(1);
}
function exclaim (str) {
  return str + '!';
}

let result = "hello"
  .|> (doubleSay)
  .|> (capitalize)
  .|> (exclaim)

console.log(result); //=> "Hello, hello!"