indongyoo

// String
console.log(
  map(a => a + 1, "12")
);
// ["11", "21"]

// NodeList
console.log(
  map(el => el.nodeName, document.querySelectorAll('head *'))
);

indongyoo

// Iterator 2
console.log(
  map(
    ([key, val]) => [key.toUpperCase(), val + 1],
    new Map([['a', 1], ['b', 2]]).entries())
);
// [["A", 2], ["B", 3]]

console.log(
  new Map(map(

indongyoo

const { reduce, log } = Functional;

const add = (a, b) => a + b;

log( reduce(add, [1, 2]) ); // 3
log( reduce(add, 0, [1, 2]) ); // 3
log( reduce(add, 10, [1, 2]) ); // 13
log( reduce(add, 100, { a: 1, b: 2 }) ); // 103
log( reduce(add, 200, new Map([['a', 1], ['b', 2]])) ); // 203
log( reduce(add, 300, new Set([1, 2])) ); // 303

indongyoo

const info = {
  title: "Function",
  list: new Map([
    ['map', 'Functor f => (a -> b) - f a -> f b'],
    ['reduce', 'Collection c => ((a, b) -> b) -> b -> c a -> a']
  ])
};

log(
  reduce(

indongyoo

const isAny = a => a !== undefined;
const some = map(isAny, find);

log( some(a => a > 2, [1, 2, 4, 5]) );
// true
log( some(a => a < 2, [1, 2, 4, 5]) );
// true
log( some(a => a > 10, [1, 2, 4, 5]) );
// false

indongyoo

const { match } = Functional;

const a = 2;

const b = match (a)
  .case(1) (_=> '1이군요!')
  .case(2) (_=> '2네요?')
  .else    (_=> '1도 2도 아니군요.');

console.log(b);

indongyoo

const f2 = a =>
  match (a)
    .case(1) (
      a => a + 10,
      a => a + 100,
      a => a + 1000)
    .case(2) (
      a => a + 20,
      a => a + 200,
      a => a + 2000)

indongyoo

const { isMatch } = Functional;

console.log( isMatch({ a: 1 }, { a: 1, b: 2 }) ); // true
console.log( isMatch([2], [1, 2, 3]) ); // true
console.log( isMatch(5, 5) ); // true
console.log( isMatch("a", "a") ); // true

console.log( isMatch({ a: 1, b: 3 }, { a: 1, b: 2 }) ); // false
console.log( isMatch(5, 50) ); // false
console.log( isMatch("a", "aaa") ); // false

indongyoo

const { map, log } = Functional;

function some1(f, coll) {
  const bools = map(f, coll);
  for (const bool of bools) if (bool) return true;
  return false;
}

log( some1(a => a > 15, [10, 20, 30, 40]) );
// true

indongyoo

function some2(f, coll) {
  for (const val of coll) if (f(val)) return true;
  return false;
}

log( some2(a => a > 15, [10, 20, 30, 40]) );
// true