Questions tagged [ecmascript-6]
ECMAScript 6 reached feature complete status in 2014. The features vary widely from completely new objects and patterns to syntax changes to new methods on existing objects.
486
questions
0
votes
1answer
34 views
3
votes
2answers
53 views
Sort, slice and rebuild new object with array data
I'm using the matomo reports api to pull out some data in js.
For some charts, I'm in the need to sort the array data based on inner property value ("val"), further to get only the 3 highest (Hong ...
0
votes
0answers
20 views
Multiple animation control using Vanilla JS ES6
What I'm doing
Divide members into five section, and apply animation for each member to reveal at first.
When I click the section, it is expanded to whole viewport and introduce detail about ...
4
votes
1answer
52 views
Event triggers for animations using vanilla ES6
I'm new to JS and wanna know right code style or approach to cod Vanilla JS using ES6. To practice this, I'm using ESLint JS code-style of AirBnb and referencing clean-code-javascript repo. However, I ...
0
votes
0answers
34 views
How to filter URL from the array list based on the string name with regExp?
The solution found to filtering pathname with customising current normalizeTme() function. For sure it is not the ideal way of ...
4
votes
2answers
62 views
An Express route, which renders a page, and makes use of socket.io
This is the code for a basic endpoint in my express app routes folder. This firstly renders a page, and then on a continuous loop, renders information about some random "Breaking Bad" character.
The ...
4
votes
1answer
50 views
Pivotting SQL Table Response to JSON in JavaScript
Issue
Our API returns two formats JSON and this SQL table format. I'm not sure what it is truly called so I'll give a few examples below. Like all API responses, it can be a list or a single response ...
4
votes
1answer
103 views
Pulling data from the GitHub API for user repositories
I'm looking for specific feedback on a major design change that I plan on making to my personal website (https://aleksandrhovhannisyan.github.io/).
Currently, the Projects section contains hardcoded ...
4
votes
1answer
49 views
Triggering a callback when user put in the Konami cheat code anywhere in the page
I wrote this just for some fun and also to practise my ES6 skills.
When user key in the Konami Cheat Code(⬆️⬆️⬇️⬇️⬅️➡️⬅️➡️🅱️🅰️↩️) anywhere in the page, it should trigger a callback. In the following ...
0
votes
0answers
23 views
Details/Dropdown toggler
I haven't had a great deal of time to build components using some of the more fun items that have come since ES6+ started hitting the scene, but figured I'd share a dropdown snippet I created and get ...
4
votes
2answers
71 views
RegEx version control
this is my first time on this stack exchange :)
I created a little script to check for the latest version of specified API version available, but I am wondering if I am using the best way possible ...
3
votes
3answers
45 views
Simple javascript code to create an image caption
I'm trying to become better at javascript and have written a simple script that just creates some html from getting some details from some elements (e.g. the image alt text) and inserts it onto the ...
6
votes
4answers
1k views
Find all letter Combinations of a Phone Number
The task
is taken from LeetCode
Given a string containing digits from 2-9 inclusive, return all possible letter combinations that the number could represent. A
mapping of digit to letters (just ...
0
votes
0answers
51 views
Merge Two Sorted Lists in JavaScript
The task is taken from LeetCode
Merge two sorted linked lists and return it as a new list. The new list should be made by splicing together the nodes of the first two
lists.
...
3
votes
1answer
55 views
Whitelist for textarea and save input to file
I'm working with product codes, so a user can only scan these type of product codes into a textarea.
I don't know if my code is written the best way possible, or has good performance.
I'm using a ...
3
votes
0answers
99 views
Merge Intervals in JavaScript
This task is taken from Leetcode -
Given a collection of intervals, merge all overlapping intervals.
Example 1:
...
2
votes
3answers
71 views
Jewels and Stones
The task
is taken from leetcode
You're given strings J representing the types of stones that are
jewels, and S representing the stones you have. Each character in S
is a type of stone you ...
2
votes
1answer
49 views
Number of Islands
The task
is taken from leetcode
Given a 2d grid map of '1's (land) and '0's (water), count the number
of islands. An island is surrounded by water and is formed by
connecting adjacent lands ...
2
votes
1answer
58 views
Length of the longest consecutive run of 1s in its binary representation
The task
Given an integer n, return the length of the longest consecutive run
of 1s in its binary representation.
For example, given 156, you should return 3
My function solution 1
Style 1
...
4
votes
2answers
67 views
Static site generator using JavaScript Promises
I have created a small static site generator (for learning purposes) in Javascript ES6, using Promises, but I am not certain of how to use them well. The code below works fine, but I wonder if i can't ...
3
votes
1answer
58 views
Longest Consecutive Sequence
This task is taken from Leetcode -
Given an unsorted array of integers, find the length of the longest
consecutive elements sequence.
Your algorithm should run in \$O(n)\$ complexity.
...
1
vote
1answer
35 views
Daily Temperatures
The task
is taken from leetcode
Given a list of daily temperatures T, return a list such that, for
each day in the input, tells you how many days you would have to wait
until a warmer ...
4
votes
1answer
92 views
Encode and Decode TinyURL
The task
is taken from leetcode
TinyURL is a URL shortening service where you enter a URL such as
https://leetcode.com/problems/design-tinyurl and it returns a short
URL such as http://tinyurl....
1
vote
2answers
88 views
Find out whether number is of Power of Two
The task
is taken from leetcode
Given an integer, write a function to determine if it is a power of
two.
Example 1:
Input: 1
Output: true
Explanation: 20 = 1
Example 2:
...
1
vote
1answer
48 views
Reverse Vowels of a String
The task
is taken from leetcode
Write a function that takes a string as input and reverse only the
vowels of a string.
Example 1:
Input: "hello"
Output: "holle"
Example 2:
...
3
votes
2answers
69 views
Add one to the last array element
The task
is taken from leetcode
Given a non-empty array of digits representing a non-negative integer,
plus one to the integer.
The digits are stored such that the most significant digit is ...
3
votes
1answer
54 views
Addition of Strings
The task
is taken from leetcode
Given two non-negative integers num1 and num2 represented as string,
return the sum of num1 and num2.
Note:
The length of both num1 and num2 is < ...
20
votes
4answers
3k views
Count all vowels in string
For a homework assignemnt, I was asked to complete this CodeStepByStep problem. It's coded correctly and gave me a right answer. I'm just wondering if there's an easier way to solve this problem ...
1
vote
2answers
80 views
First Unique Character in a String
The task
is taken from leetcode
Given a string, find the first non-repeating character in it and
return it's index. If it doesn't exist, return -1.
Examples:
s = "leetcode"
return ...
2
votes
2answers
62 views
Find All Numbers Disappeared in an Array
The task
is taken from leetcode
Given an array of integers where 1 ≤ a[i] ≤ n (n = size of array),
some elements appear twice and others appear once.
Find all the elements of [1, n] ...
4
votes
1answer
148 views
Island Perimeter
The task
is taken from leetcode
You are given a map in form of a two-dimensional integer grid where 1
represents land and 0 represents water.
Grid cells are connected horizontally/vertically ...
2
votes
1answer
64 views
Find Median of Two Sorted Arrays in JS
The task
is taken from leetcode
There are two sorted arrays nums1 and nums2 of size m and n
respectively.
Find the median of the two sorted arrays. The overall run time
complexity should ...
4
votes
2answers
91 views
Create a min stack
The task
is taken from leetcode
Design a stack that supports push, pop, top, and retrieving the
minimum element in constant time.
push(x) -- Push element x onto stack.
pop() -- Removes ...
6
votes
1answer
95 views
Given a string containing just parentheses, determine if the input string is valid
The task
is taken from leetcode
Given a string containing just the characters '(', ')', '{', '}', '['
and ']', determine if the input string is valid.
An input string is valid if:
...
2
votes
1answer
63 views
Unique Email Addresses
The task
was taken from leetcode
Every email consists of a local name and a domain name, separated by
the @ sign.
For example, in alice@leetcode.com, alice is the local name, and
leetcode....
5
votes
1answer
82 views
Container with most water
The task
is taken from leetcode
Given n non-negative integers a1, a2, ..., an , where each represents
a point at coordinate (i, ai). n vertical lines are drawn such that
the two endpoints of ...
4
votes
3answers
149 views
Reverse Integer
The task
is taken from leetcode
Given a 32-bit signed integer, reverse digits of an integer.
Example 1:
Input: 123
Output: 321
Example 2:
...
1
vote
2answers
457 views
Longest Substring Without Repeating Characters in JS
The task
is taken from leetcode
Given a string, find the length of the longest substring without
repeating characters.
Example 1:
Input: "abcabcbb"
Output: 3
Explanation: ...
1
vote
3answers
79 views
Add Two Numbers
The task
is taken from leetcode
You are given two non-empty linked lists representing two non-negative
integers. The digits are stored in reverse order and each of their
nodes contain a single ...
1
vote
1answer
94 views
Find common characters (LeetCode)
The task
is taken from leetcode
Given an array A of strings made only from lowercase letters, return a
list of all characters that show up in all strings within the list
(including duplicates). ...
4
votes
1answer
85 views
<select multiple> with dropdown
I wanted to use <select multiple> but was annoyed by the poor design on desktops which is why I created a version with dropdown:
...
3
votes
2answers
54 views
Robot Return to Origin
The task
is taken from leetcode
There is a robot starting at position (0, 0), the origin, on a 2D
plane. Given a sequence of its moves, judge if this robot ends up at
(0, 0) after it completes ...
3
votes
1answer
97 views
TamperMonkey Script to replace the YouTube favicon with the channel logo
I felt that having a plain red favicon for every youtube tab is a little boring. So, I wrote a TamperMonkey Script with the new ES6 promises that replaces the favicon with the channel's logo. Link to ...
1
vote
2answers
46 views
Flipping an Image
The task
is taken from leetcode
Given a binary matrix A, we want to flip the image horizontally, then
invert it, and return the resulting image.
To flip ...
1
vote
2answers
46 views
Combining arbitrary number of lists inside json
I have some JSON where each key stores an array, and I need to combine all those arrays into a single array. My current solution doesn't seem the most friendly to review, but without ...
0
votes
0answers
44 views
Split string into as few substrings as possible such that each substring is a palindrome
The task
Given a string, split it into as few strings as possible such that
each string is a palindrome.
For example, given the input string racecarannakayak, return
["racecar", "anna", "...
3
votes
3answers
83 views
Rotate a linked list to the right by k places
The task
Given a linked list and a positive integer k, rotate the list to the
right by k places.
For example, given the linked list 7 -> 7 -> 3 -> 5 and k = 2, it
should become 3 -> 5 -> 7 ...
1
vote
1answer
89 views
Sort Array By Parity
The task is taken from leetcode
Given an array A of non-negative integers, return an array consisting
of all the even elements of A, followed by all the odd elements of A.
You may return any ...
2
votes
2answers
57 views
N-Repeated Element in Size 2N Array
The task
is taken from leetcode
In a array A of size 2N, there are N+1 unique elements, and exactly
one of these elements is repeated N times.
Return the element repeated N times.
...
0
votes
1answer
36 views
Items also occurs in a set
The task
You're given strings J representing the types of stones that are
jewels, and S representing the stones you have. Each character in S
is a type of stone you have. You want to know how ...
