hg-pyun

// react
const handleChange = (fieldName) => (event) => {aveField(fieldName, event.target.value)}
<input type="text" onChange={handleChange('email')} ... />

hg-pyun

getters: {
 // ...
  getTodoById: (state, getters) => (id) => {
  return state.todos.find(todo => todo.id === id) }}
  store.getters.getTodoById(2) // -> { id: 2, text: '...', done: false }

hg-pyun

// connect
export default connect()(TodoApp)

// connect with action creators
import * as actionCreators from './actionCreators'
export default connect(null, actionCreators)(TodoApp)

// connect with state
export default connect(state => state)(TodoApp)

hg-pyun

function add(x, y) {
 return x+y;
}

let increment = add.bind(undefined, 1);

console.log(increment(4) === 5); // true

hg-pyun

var curry = function(uncurried) {
  var parameters = Array.prototype.slice.call(arguments, 1);
  return function() {
    return uncurried.apply(this, parameters.concat(
      Array.prototype.slice.call(arguments, 0)
    ));
  };
};

hg-pyun

let greetDeeplyCurried = greeting => separator => emphasis => name => console.log(greeting + separator + name + emphasis);

let greetAwkwardly = greetDeeplyCurried("Hello")("...")("?");
greetAwkwardly("haegul"); // Hello...haegul?

let sayHello = greetDeeplyCurried("Hello")(", ");
sayHello(".")("haegul"); // Hello, haegul.

let askHello = sayHello("?");
askHello("haegul"); // Hello, haegul?

hg-pyun

// currying
let printInfo = group => name => console.log(group + ', ' + name);
let devGroup = printInfo('developer');
devGroup('haegul');    // developer, haegul
devGroup('jiwon');     // developer, jiwon
devGroup('sungcheon'); // developer, sungcheon

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// print
printInfo('developer', 'haegul'); // developer, haegul
printInfo('developer', 'jiwon'); // developer, jiwon
printInfo('developer', 'sungcheon'); // developer, sungcheon

hg-pyun

let printInfo = function(group, name){
  console.log(group + ', ' + name);
};
printInfo('developer', 'haegul'); // developer, haegul

hg-pyun

let sum = x => y => x+y;
let sum5 = sum(5);
let sum12 = sum5(7);
console.log(sum12, sum(5)(7)); // 12 12