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.
0
votes
0answers
15 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
2answers
38 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
56 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
43 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
23 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 ...
4
votes
3answers
380 views
Determine whether an integer is a palindrome
The task
Determine whether an integer is a palindrome. An integer is a
palindrome when it reads the same backward as forward.
Example 1:
Input: 121 Output: true
Example 2:
...
2
votes
0answers
53 views
Determine whether there exists a one-to-one character mapping from one string to another
The task
Determine whether there exists a one-to-one character mapping from one
string s1 to another s2.
For example, given s1 = abc and s2 = bcd, return true since we can map
a to b, b to ...
2
votes
3answers
70 views
Find non-duplicated integer in a list where every integer occurs three times except for one integer
The task
Given an array of integers where every integer occurs three times
except for one integer, which only occurs once, find and return the
non-duplicated integer.
For example, given [6,...
3
votes
1answer
79 views
Division without using division, multiplication, or modulus operators
The task
Implement division of two positive integers without using the
division, multiplication, or modulus operators. Return the quotient as
an integer, ignoring the remainder.
My solution
<...
2
votes
1answer
41 views
Using IndexedDB as an in-browser cache
In my site:
Users have many Activities
Each Activity has encoded_polyline data
I display these encoded_polylines on a map
I want to use IndexedDB (via Dexie) as an in-browser cache so that they don'...
1
vote
2answers
46 views
Sum of two numbers in array
The task
You are given two non-empty arrays representing two non-negative
integers. The digits are stored in reverse order and each of their
items contain a single digit. Add the two numbers ...
1
vote
1answer
49 views
Find busiest period in building
The task
You are given a list of data entries that represent entries and exits
of groups of people into a building. An entry looks like this:
{"timestamp": 1526579928, count: 3, "type": "...
0
votes
1answer
41 views
Find indices of two numbers such that they add up to a target
The task
...is taken from leetcode
Given an array of integers, return indices of the two numbers such
that they add up to a specific target.
You may assume that each input would have ...
1
vote
0answers
43 views
Find all pairs of unique indices in a list such that the concatenation of the two words is a palindrome
The task
Given a list of words, find all pairs of unique indices such that the
concatenation of the two words is a palindrome.
For example, given the list ["code", "edoc", "da", "d"], return ...
1
vote
1answer
107 views
User upload & Drag image and update text
I am allowing user to upload images & drag uploaded image once user click on mask images, also gave an option to Edit the text....
I am fetching mask images and text from json file....
I am ...
3
votes
1answer
84 views
AWS Lambda function to update newly added DynamoDB records
Approach
All data is submitted into my DynamoDB from another Lambda > API Integration function whereas the lastUpdated row gets inserted as ...
2
votes
0answers
46 views
React code to build shopping cart
I have built a basic shopping cart simulator. All it does is add and remove items between two different basket (i.e. aisle vs basket).
While working on the problem I started to think about the ...
1
vote
0answers
47 views
Find the square root of n
The task:
Given a real number n, find the square root of n. For example, given n
= 9, return 3.
My solution:
...
3
votes
1answer
51 views
Flappy Bird game supporting local multiplayer of up to 2 players
The game is hosted here.
GitHub repo
This is my first Phaser 3 game/project and I'm still pretty new to Javascript so I'm sure there are many things I could be doing better. The number 1 thing that ...
0
votes
1answer
38 views
Extracting grouped objects into a flattened list
I need to optimize this javascript method because it is a bit slow, I don't want to use the flat() command, as for some reason my angular6 app does not understand the vanilla flat() command, or ...
4
votes
1answer
86 views
AutoSuggest: Better way to implement focus after inserting a snippet
Introduction:
I am working on a javascript plugin AutoSuggest, My aim is to create an IDE like autocomplete experience in web applications using JavaScript.
One of the features I have implemented is ...
2
votes
2answers
34 views
Optimized pulling items out of arrays in nested objects
I found a couple of similar questions, but they were mostly outdated.
Here's the problem: create a flat array from the values in several arrays contained in several nested objects.
...
2
votes
1answer
48 views
Function to filter comments and ratings, with pagination support
I have a web component that is rendering a list of items and I have this method for filtering these items based in a filterBy object that is being updated by other ...
2
votes
2answers
133 views
Given a set of closed intervals, find the smallest set of numbers that covers all the intervals
The Task:
Given a set of closed intervals, find the smallest set of numbers that
covers all the intervals. If there are multiple smallest sets, return
any of them.
For example, given the ...
4
votes
2answers
78 views
square the elements of a sorted list and give the output in sorted order
Given a sorted list of integers, square the elements and give the
output in sorted order.
For example, given [-9, -2, 0, 2, 3], return [0, 4, 4, 9, 81].
My solution 1:
...
2
votes
2answers
91 views
Reverse the words in string
The task:
Given a string of words delimited by spaces, reverse the words in
string. For example, given "hello world here", return "here world
hello"
Follow-up: given a mutable string ...
0
votes
0answers
52 views
Find all starting indices in a string which are anagrams of a word
The task:
Given a word W and a string S, find all starting indices in S which
are anagrams of W.
For example, given that W is "ab", and S is "abxaba", return 0, 3, and
4.
My solution:
<...
5
votes
5answers
99 views
Get n-th perfect number
The task:
A number is considered perfect if its digits sum up to exactly 10.
Given a positive integer n, return the n-th perfect number.
For example, given 1, you should return 19. Given ...
5
votes
1answer
75 views
Passing a callback to a component in Vue.js
I'm currently trying to teach myself Vue.js and I've just created my first small project: a simple todo list. While writing the component I discovered that you can't access methods from the parent ...
2
votes
2answers
61 views
2
votes
1answer
97 views
Symfony AJAX comment system with votes
How can I improve this code ? It was quite hard to implement AJAX comment system in Symfony 3, and result is a bit of mess:
Controller:
...
0
votes
1answer
39 views
Returning a new object reference when mutation happens
i attempted to create a way (not sure if already implemented by someone) by which when i update a property of an object. it returns a new reference of the object with the new value.
i have a usecase ...
2
votes
0answers
37 views
Simple table sorting using plain Javascript
This is a simple and clean script for sorting a specific column in a table. You could edit and parametrize it to add more customization, but I wanted to share the base concept.
Base concept (I think ...
1
vote
0answers
15 views
JavaScript code for MAC registration micro webservice
The following code is part of the front-end of a micro webservice for users to allow them to register MAC addresses of their network devices and administrators to enable those and to generate a ...
-1
votes
2answers
70 views
Two-sum solution in JavaScript [closed]
I was given this question during an interview. It is similar to two sum problems and I would like to ask for feedback for my solution.
Merging 2 Packages
Given a package with a weight limit ...
3
votes
1answer
119 views
Tip Calculator in pure JS
A simple tip calculator that asks for the total bill amount, service quality (used to determine what percentage of the total cost will be tipped), and how many people are sharing the bill (used to ...
2
votes
1answer
119 views
Shuffle deck of cards in JavaScript
I know randomness in programming can be a deep topic, and searching the topic seems to result in Fisher-Yates being the best method, but I'm curious what people would say about this method.
Basically,...
2
votes
1answer
68 views
Toggling Strict mode in JS
I made this code because, I figured that it might be an interesting concept, and that it would be nice to see it work. It enables the toggling of strict mode in any string of code.
It even allows you ...
3
votes
1answer
76 views
0
votes
2answers
74 views
JavaScript ES6 import / export
I am experimenting with JavaScript ES6 import and export and wanted to achieve the following:
Use the import / export style of including JavaScript files.
Import a class file and create an instance
...
3
votes
3answers
140 views
Basic orbiting planets in P5.js
I started studying JavaScript about a week ago and I would like some opinions and advice on my code. This program just creates a canvas and instantiates 5 planets that orbit around a sun, giving them ...
4
votes
3answers
100 views
fizzbu| - Fizzbuzz with dynamic height
Here is a variation on a theme: fizzbuzz. After providing this answer recently, I decided to practice some VueJS skills with outputting the values and conditionally applying styles based on the value. ...
2
votes
0answers
70 views
ReactJS Typewriting animation
One of the dream idea to build typewriting in ReactJS. The code seems to be working, still there are something looks not that great in the code 😔
Looking for better solution (best practice) in the ...
3
votes
2answers
169 views
5
votes
2answers
101 views
Find top two clothing sizes in the array
I was recently asked this question in an interview. Here is the solution I came up with. Please let know if I could have done this differently or in a more efficient manner.
The question is as ...
1
vote
1answer
38 views
Promise for request/response with timeout
Below is a piece of code that uses a promise for sending a request to a server, and to wait for an answer. Under normal conditions the server will always respond immediately,
But of course you don't ...
2
votes
4answers
163 views
A simple function that removes empty or tags containing just ' '
I've written a function that should get rid of empty p, span, etc tags and those with just ' ' and am looking for ways to improve it. My original solution was very 'wet', but I've managed to come ...
3
votes
1answer
91 views
Display and search through a JSON's items in Vue.js
I have put together this small application that displays a "Users" JSON in an HTML5 table.
I use Bootstrap 3, Axios and Vue.js 2 for this purpose.
Here is the code:
...
2
votes
1answer
87 views
React Component Design
Building out a React component that is supposed to hold the following information and display it in a feed-like page. The idea is to later map over the individual entries in an array.
Author
...
3
votes
2answers
55 views
Storing statistics as JSON in a simulation game
I am working on a choice-based simulation and players have to choose between different locations, I am pushing those choices to an array locationLog and my ...
