fnes_3_map_1.js

const { map } = Functional;

console.log( map(a => a + 1, [1, 2]) );
// [2, 3]

console.log( map(a => a + 1, {a: 1, b: 2}) );
// {a: 2, b: 3}

console.log( map(a => a + 1, new Map([['a', 1], ['b', 2]])) );
// Map(2) {"a" => 2, "b" => 3}

console.log( map(a => a + 1, Promise.resolve(1)) );
// Promise {<resolved>: 2}

const f = map(a => a + 1, _=> 1);
console.log(f);
// (..._) => f(coll(..._))
console.log(f());
// 2