bpinedah

const wait = delay => {
  return new Promise(resolve => {
    setTimeout(() => {
      resolve('Hello');
    }, delay);
  });
};

wait(5000).then(r => console.log(r));

bpinedah

// Data example
const items = [{name: 'Bruce' }, {name: 'Fabs'}, {name: 'Bruce'}, {name: 'Gaby'}];

/**
 * @description Filter by one where condition
 * @param w Where condition function
 * @returns {Function} filter function
 */
const filter = w => a => a.filter(w);

bpinedah

/**
 * @description Compose function to compose functions
 * @param fns Functions to reduce on composition
 * @returns {Function} Compose function
 */
const compose = (...fns) => x => fns.reduceRight((f, m) => m(f), x);

// Combine functions
compose(
  map(applier('age', 33)),

bpinedah

// Data example
const items = [{name: 'Bruce' }, {name: 'Fabs'}, {name: 'Bruce'}, {name: 'Gaby'}];

/**
 * @description Filter by one where condition
 * @param w Where condition function
 * @returns {Function} filter function
 */
const filter = w => a => a.filter(w);

bpinedah

const items = [{name: 'Bruce' }, {name: 'Fabs'}, {name: 'Bruce'}, {name: 'Gaby'}];
const filter = w => a => a.filter(w);
const where = (k, v) => i => i[k] === v;
const map = fnMap => f => f.map(fnMap);
const applier = (k, v) => x => x[k] = v;

map(applier('lastname', 'Wayne'))(filter(where('name', 'Bruce'))(items))
console.log(items);
/*
[{ name: 'Bruce', lastname: 'Wayne' },

bpinedah

const items = [{name: 'Bruce' }, {name: 'Fabs'}, {name: 'Bruce'}, {name: 'Gaby'}];
const filter = function(key, value){
  return function(i){
    return i[key] === value;
  }
}
const applier = function(key, value){
  return function(i){
    i[key] = value;
  }

bpinedah

const items = [{name: 'Bruce' }, {name: 'Fabs'}, {name: 'Bruce'}, {name: 'Gaby'}];

items.filter(function(i){
  return i.name === 'Bruce';
}).map(function(i){
  i.lastname = 'Wayne';
});

console.log(items);

bpinedah

const list = [1, 2, 3];
const map = arr => fn => arr.map(fn);
const double = i => i * 2;
map(list)(double); //[2, 4, 6]

bpinedah

const list = [1, 2, 3];

function double(i) {
  return i * 2;
}
function map (arr, fn) {
  return arr.map(fn);
}
map(list, double); //[2, 4, 6]

bpinedah

const list = [1, 2, 3];

function map(arr) {
  return arr.map(function double(i){
    return i * 2;
  })
}
map(list); // [2, 4, 6]