saginadir

function updateUserNameSaveToDb(user, newName, db) {
  user.name = newName.charAt(0).toUpperCase() + newName.slice(1).toLowerCase();
  db.save(user);
  $('.user-greet').html(`Hello ${user.name}`);
}

saginadir

// https://jsbin.com/guhumaq/4/edit?html,js,console

// -- Helpers ------------------- //

const reduce = (fn, arr) => arr.reduce(fn, 0)

const add = (x, y) => x + y;

// -- Sum Func ------------------ //

saginadir

const pipe = (fn,...fns) => (...args) => !fns.length ? fn(...args) : pipe(...fns)(fn(...args));

const getKittens = 
  cats => cats.filter(cat => cat.months < 7);

const namesToList = 
  listOfObjects => listOfObjects.map(ob => ob.name);

const getKittenNames = pipe(getKittens, namesToList);

saginadir

class Student {
  constructor (student) {
    this.student = student;
  }
  
  map(f) {
    const student = Object.assign({}, this.student);
    return new Student(f(student))
  }
  

saginadir

const student = newStudent('Josh');

student
  .logMyState()
  .giveHomework(2)
  .doHomework() // "Missing pencil to do homework"
  .take('ruler')
  .take('coffee')
  .logMyState()
  .doHomework() // "Missing pencil to do homework"

saginadir

const wrap = (student) => ({
  take: (item) => {
    student.items.push(item);
    return wrap(student);
  },
  giveHomework: (homeworkQuantity) => {
    student.homeworkQuantity += homeworkQuantity;
    return wrap(student);
  },
  doHomework: () => {

saginadir

const wrap = (el) => ({
  css: (attribute, value) => {
    el.style[attribute] = value;
    return wrap(el);
  },
  hide: () => {
    return wrap(el).css('display', 'none');
  },
  show: () => {
    return wrap(el).css('display', 'block');

saginadir

const toArray = (...args) => args; // turns all args to array.

const res1 = toArray(1, 'f', 'Apple', {hello: 'world'})[2].toUpperCase();
console.log(res1); // Will outut APPLE;

const res2 = toArray(1, 'f', 'Apple', {hello: 'world'})[2].toUpperCase().substr(0,3);
console.log(res2); // Will outut APP;

saginadir

const toArray = (...args) => args; // turns all args to array.

// [2] position hold 'Apple', allowing us to directly access it after the function.
toArray(1, 'f', 'Apple', {hello: 'world'})[2];

saginadir

const add = (a, b) => a + b;
console.log(add(3, 4)); // will output 7

add(1, 2) + add(3 + 3); // Add the result of 2 functions together