hw0k

function pipe(...functions) {
  return input => functions.reduce((value, func) => func(value), input);
}

function compose(...functions) {
  return input => functions.reduceRight((value, func) => func(value), input);
}

hw0k

function createPage({
  title = '', // 해당 값이 없을 때 기본으로 사용할 값
  body = '',
  tags = [],
  actions = [],
} = {}) { /* ... */ }

// usage
createPage({
  title: 'Hello world!',

hw0k

function createPage(title, body, tags, actions) { /* ... */ }

// usage
createPage('Hello world!', 'bodybodybody', ['onboarding'], []);

hw0k

function createPage({ title, body, tags, actions }) { /* ... */ }

// usage
createPage({
  title: 'Hello world!',
  body: 'bodybodybody',
  tags: ['onboarding'],
  actions: [],
});

hw0k

async function sendNotifications() {
  const preferences = await UserPreferencesRepository.findAll();
  
  preferences
    .filter(isPreferenceHasAllowedNotification)
    .forEach(NotificationModule.send);
}

function isPreferenceHasAllowedNotification(preference) {
  return preference.hasAllowedNotification;

hw0k

async function sendNotifications() {
  const preferences = await UserPreferencesRepository.findAll();
  
  preferences.forEach(preference => {
    if (preference.hasAllowedNotification) {
      NotificationModule.send(preference);
    }
  });
}

hw0k

async function checkS10(deviceName) {
  return deviceName.includes('Galaxy S10');
}

hw0k

import DeviceInfo from 'react-native-device-info';

async function checkS10() {
  const deviceName = await DeviceInfo.getDeviceName();
  
  return deviceName.includes('S10');
}

hw0k

      _      _      _
    >(.)__ <(.)__ =(.)__
     (___/  (___/  (___/

hw0k

function* infiniteValue(acc = 0) {
  yield acc;
  yield* infiniteValue(acc + 1);
}

const iter = infiniteValue();
console.log(iter.next().value); // 0
console.log(iter.next().value); // 1
console.log(iter.next().value); // 2
console.log(iter.next().value); // 3