kironroy

// reduce method is most powerful array method in JavaScript
// maximum value with reduce

const max = movements.reduce((acc, mov) => {
  if (acc > mov) return acc;
  else return mov;
}, movements[0]);
console.log(max);

kironroy

const movements = [200, 450, -400, 3000, -650, -130, 70, 1300];

const balance = movements.reduce((acc, cur) => acc + cur, 0);
console.log(balance);

kironroy

// filter method
// push in JS to make code more functional
// also more practical application:
// method chaining!

const movements = [200, 450, -400, 3000, -650, -130, 70, 1300];

const deposits = movements.filter(mov => mov > 0);

console.log(movements);

kironroy

'use strict';

// Data
// forEach

const info1 = {
  owner: 'Sita Troy',
  movements: [200, 450, -400, 3000, -650, -130, 70, 1300],
  interestRate: 1.2, // %
  pin: 1111,

kironroy

// map is different than forEach
// forEach creates side effects
// map returns each of the strings
// gets added to a new array
// maps have no side-effects

const movements3 = [200, 450, -400, 3000, -650, -130, 70, 1300];

const movementDesc = movements3.map(
  (mov, i) => 

kironroy

const movements = [200, 450, -400, 3000, -650, -130, 70, 1300];

// for

for (const [i, movement] of movements.entries()) {
  if (movement > 0) {
    console.log(`Movement ${i + 1}: You deposited ${movement}`);
  } else {
    console.log(`Movement ${i + 1}: You withdrew ${Math.abs(movement)}`);
  }

kironroy

// First-Class Functions
// functions are simlply values
// functions are just another 'type' of object

// Higher-Order Functions
// A function that recevies another function as
// an argument, that returns a new function, or, both

// const greet = () => console.log('Hi Vita');
// btnClose addEventListener('click', greet);

kironroy

// higher order function, strings example

const capitalize = function (str) {
  return str.toUpperCase();
};
console.log(capitalize('rita roy'));

const yo = function (str, fx) {
  console.log(`Original String: ${str}`);
  console.log(`Transformed ${fx(str)}, Yo!!! ☝️`);

kironroy

// data

const firstName = 'first_name';
const someVariable = 'Some_Variable';
const calculateAge = 'calculate_AGE';
const delayedDeparture = 'delayed_departure';
// my var below, check it it works
const foo_no = 'FOO NO'

// array

kironroy

'use strict';

// Data needed for a later exercise

const flights =
  '_Delayed_Departure;fao93766109;txl2133758440;11:25+_Arrival;bru0943384722;fao93766109;11:45+_Delayed_Arrival;hel7439299980;fao93766109;12:05+_Departure;fao93766109;lis2323639855;12:30';

const airline = 'TAP Air Portugal';
const plane = 'A320';