giltayar

case class JsonableEither[+L, +R](left: Option[L] = None, right: Option[R] = None) {
  require(left == None && right != None ||
    left != None && right == None)
}

giltayar

function stringToArray(s) {
  const retVal = [];
  
  for (let i = 0; i < s.length; ++i) {
    retVal.push(s[i]);
  }
  
  return retVal;
}

giltayar

console.log(stringToArray('Robin H😀😀d'));

giltayar

console.log(stringToArray('Robin Hoווd'));

giltayar

const str = 'H😀😀d';

const iterator = str[Symbol.iterator](); // get the iterator from string
iterator.next(); // skip over the 'H'
console.log(iterator.next().value); // get the first emoji

giltayar

function stringToArray(s) {
  const retVal = [];
  
  for (const ch of s) {
    retVal.push(ch);
  }
  
  return retVal;
}

giltayar

console.log(Array.from('Robin H😀😀d').map(ch => ch == '😀' ? '🙃' : ch));

giltayar

console.log(Array.from('Robin H😀😀d').map(ch => ch == '😀' ? '🙃' : ch).join(''));

giltayar

exports.writeSumToFile = (a, b, fileSumWriter) => {
  const sum = a + b

  fileSumWriter(sum)
}

giltayar

const {describe, it} = require('mocha')
const {expect} = require('chai')
const calculator = require('../../lib/calculator')

describe('calculator', function () {
  const stream = (characters, calculatorState = calculator.initialState) =>
    !characters
      ? calculatorState
      : stream(characters.slice(1),
               calculator.nextState(calculatorState, characters[0]))