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
1answer
32 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
32 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:
<...
4
votes
5answers
85 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 ...
3
votes
1answer
41 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
55 views
2
votes
1answer
40 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
36 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
34 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
14 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
55 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 ...
2
votes
1answer
51 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
73 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
64 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
40 views
0
votes
2answers
59 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
93 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. ...
1
vote
0answers
50 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
114 views
5
votes
2answers
88 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
33 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
79 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 ...
2
votes
1answer
81 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
82 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
54 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 ...
3
votes
2answers
99 views
Lazy-loading iframes as they scroll into view
I'm working in a Tableau driven system, with large numbers of charts, I needed a way to reduce the strain of the initial load of our app. It's fairly simple, but wanted to ensure I accounted for every ...
0
votes
1answer
39 views
Tile and grid abstraction
This question is a small subset of the problem I am trying to solve.
I am trying to learn to break problems into better abstractions.
The original problem I am trying to solve is:
Write a JS ...
0
votes
1answer
42 views
Custom indexOf for strings javascript with regex
I was wondering how efficient my code is creating custom indexOf for strings in JavaScript using regex instead of looping with a for statement the whole way in most ...
3
votes
2answers
76 views
Data formatting, splitting objects & deleting key's/values
I am quite bad at data manipulation and after a lot of time I was finally able to get it working how I wanted. The thing is I don't like all the delete operations, I think the code can be a lot ...
3
votes
3answers
106 views
Showing statistics of popular JavaScript frameworks from GitHub API
I am currently working on a simple app to check the stats of popular javascript frameworks. For this I am using the Github API to get certain data sets and have come close to finishing my project.
<...
4
votes
3answers
66 views
Take a limited number of items from a potentially infinite generator
Hypothetically, I have a bunch of generators that never end, like:
function* progression() {
let n = 0;
while (true) {
yield n++;
}
}
I want to take ...
4
votes
1answer
131 views
Node.JS Server Queue Processor
I implemented a simple queuing system for my Node.JS app and wanted a critique on it's structure.
...
1
vote
4answers
221 views
Function to determine the direction of an arrow
I have a function in a project that I feel could be written better. The purpose of the function is to return the direction of an arrow based on two parameters.
...
0
votes
0answers
16 views
Selecting rows on condition in a table
I have a table with courses. The user that is currently logged in can mark these courses as attended and unattended. There can be multiple rows selected.
The logic for this row selecting looks like ...
0
votes
1answer
44 views
Return the first word with the greatest number of repeated letters
I'm learning JavaScript and have written a function that accepts a string and returns the first word with the greatest number of repeated letters. For example:
Input:"Hello apple pie" - Output:"Hello"...
2
votes
3answers
90 views
1
vote
1answer
42 views
Turn a list of words into a dictionary
I am looking for a way to turn a list of words that may have duplicates into a dictionary/map that counts the number of occurrences of words. After spending some time with the problem, this seems to ...
0
votes
1answer
37 views
Is this a good way to use Try catch? [closed]
I'm new to handling errors and am not sure how to do it, basically, in a speicific request err.code === 11000 is not actually an error, but expected behaviour. I ...
6
votes
3answers
465 views
Compute count of unique words using ES6 sets
I have written a function which counts how many unique words are included in a given text.
The source-code:
...
2
votes
2answers
142 views
Reformatting a date from YYYY-MM-DD to MM/DD/YYYY
In this small bit of JavaScript, a date is passed in as YYYY-MM-DD. It's formatted like this to be passed to the backend system. On the front end, we need to ...
2
votes
2answers
68 views
Simple form validation in javascript
Used to use Laravel's easy to use form validation class, decided to mimic it in JS. I've been learning JS for 4 days now and decided to write my first piece of real code.
I'm pretty sure its full of ...
-1
votes
1answer
59 views
Manipulating arrays to extract unique objects and count occurrences
The data describes cycling activities (key1) and chunks of them (key2). In total there are around 1,000 ...
3
votes
1answer
47 views
Vue component over-complication
I'm building a date range selector, and while this works, I feel like I'm making it more complicated than it needs to be. Is there a more elegant way of writing this?
Possibly using computed values ...
1
vote
1answer
26 views
Test-Spy Implementation
I have tried to write a test-spy myself. Just for getting more familar with the topic.
Here's the code:
...
0
votes
1answer
28 views
Mapping properties between two Objects of different structure
Something I've found myself having to do reasonably often is map properties from an Object (usually a heavily nested MongoDB document) to a different 'shape' to then pass it to a function call or API ...
1
vote
1answer
167 views
Dispatching Vuex getter via setInterval
I am fetching the friend list for a chat application using a Vuex store. I need to dispatch the getter via an interval. Is there a best practices way to do this?
...
1
vote
0answers
33 views
Javascript time series data combination
I've written code that performs a merge of two streams of sorted time series data. The first stream is taken to be the primary and any successive streams are merged into it, using the nearest ...
2
votes
1answer
46 views
O(n) Object Pool
I recently rewrote my object pool design to \$O(n)\$ complexity. I did this using a linked list, which is not native in JavaScript. It does not, unfortunately, automatically assign ...
1
vote
1answer
29 views
duplicated operator(or attribute) on the same input control - v-model and @change
I wrote a code like below - It is nuxt.js, which is one of the Vue frameworks. This code will be expected to
When change event triggered, update ...
1
vote
2answers
93 views
Find if cookie name exists in the cookie string
I need to determine whether a cookie name is available or not in the cookie string. I have achieved this. We can use cookie-parser package but I don't want to use that package so I have written the ...
3
votes
0answers
30 views
Jest unit test that handles a wrapped Promise
I've wrapped an imported function (a promise) and attempted to write unit tests that bring my codebase to 100% coverage.
...
