levichen

const Promise = require('bluebird');
const readFile = Promise.promisify(require('fs').readFile);
const fileList = ['file1.txt', 'file2.txt', 'file3.txt'];

const promises = fileList.map((filename) => {
  return readFile(filename);
});

Promise.all(promises)
  .then((contents) => {

levichen

var chai = require('chai');
var expect = chai.expect;

describe('Test Pascals Traiangle', function() {
  it('Test numRows = 0', function() {
    var numRows = 0;
    var result = generate(numRows);
  
    expect(result).to.deep.equal([]);
  });

levichen

/**
 * @param {number} numRows
 * @return {number[][]}
 */
var generate = function(numRows) {

  if (numRows === 0) return [];
  
  var arr = [[1]];

levichen

+---+---+---+---+---+---+
|   | 0 | 1 | 2 | 3 | 4 |
| 0 | 1 |   |   |   |   |
| 1 | 1 | 1 |   |   |   |
| 2 | 1 | 2 | 1 |   |   |
| 3 | 1 | 3 | 3 | 1 |   |
| 4 | 1 | 4 | 6 | 4 | 1 |
+---+---+---+---+---+---+

levichen

var chai = require('chai');
var expect = chai.expect;

describe('Test Quick Sort', function() {
  it('Expect 4 is true', function() {
    var input = 4;
    var result = isPowerOfFour(input);
  
    expect(result).to.be.true;
  });

levichen

/**
 * @param {number} num
 * @return {boolean}
 */

var isPowerOfFour = function(num) {
  if (num === 1) return true;

  var mStr = num.toString(4);
  

levichen

var chai = require('chai');
var expect = chai.expect;

describe('Test intersection', function() {
  it('Expect input [1, 2, 2, 1] and [2, 2] will equal [2]', function() {
    var nums1 = [1, 2, 2, 1];
    var nums2 = [2, 2];

    var result = intersection(nums1, nums2);
  

levichen

/**
 * @param {number[]} nums1
 * @param {number[]} nums2
 * @return {number[]}
 */
 
var intersection = function(nums1, nums2) {
  var isExistArray = [false, false, false, false, false, false, false, false, false, false];
  var result = [];

levichen

var chai = require('chai');
var expect = chai.expect;

describe('Test Find The Difference', function() {
  it('Test1', function() {
    var string1 = "abc";
    var string2 = "abct"
    var result = findTheDifference(string1, string2);
  
    expect(result).to.equal("t");

levichen

/**
 * @param {string} string1
 * @param {string} string2
 * @return {string}
 */

var findTheDifference = function(string1, string2) {
  var mStr = 'abcdefghijklmnopqrstuvwxyz';

  for (var i=0; i<mStr.length; i++) {