challenge ideas - Githubissues

lstkz commented 4 years ago

Pyramid investment api

John read about Pyramid Scheme on Wikipedia and he has an idea of making quick money. Help John in creating a simple Proof of Concept that will simulate his system. No real money involved!

The pyramid has the following rules.

To join the system, you must pay $5000 to the referrer user (parent user).
Each user that receives money must transfer 50% to the referral. The amount must be rounded down to full cents. For example: if the user received $1.35 then $0.67 will be transferred to the referrer.
The root user is the system, and he doesn't have to transfer any money to the parent/referrer user. The amount received by the root is John's income.

Example: Assume the following user hierarchy.

      (root)
      -    -
    user1  user2
    -   - 
user3   user4
  -
user5

When the system is new, there are no users.
user1 registers and pays $5000 to the (root).
user2 registers and pays $5000 to the (root).
user3 registers and pays $5000 to the user1. user1 pays $2500 to the (root).
user4 registers and pays $5000 to the user2. user2 pays $2500 to the (root).
user5 registers and pays $5000 to the user3. user3 pays $2500 to the user1. user1 pays $1250 to the (root).

Refer to the swagger spec for complete API specification.

Three endpoints:

/reset - clears the database
/register - registers a new user, referrer is optional
```
{
"username": string,
"referrer": string
}
```

/summary - returns a pyramid summary

{
"income": number,
"userCount": number,
"hierarchyDepth": number
}

/users/:username/summary - returns a summary for the specified user
```
{
"income": number,
"userCount": number
}
```

lstkz commented 4 years ago

Friend Network Explorer frontend

todo: infinitely nested routes where you can browse friends of the user

lstkz commented 4 years ago

Category cleaner api

todo: An article has many categories. A category may have a parent category. Create an endpoint that removes all stale categories. A stale category is a category that it's not referenced by any article, and any child category is also not referenced by any article.

lstkz commented 4 years ago

Simple Product XML Converter api todo: Create a single endpoint that will accept an XML, and output a JSON object.
example XML:

<Product>
  <Name>iPhone</Name>
  <Category>phones</Category>
  <Cost>4000</Cost>
  <Tags>
     <Tag>apple</Tag>
     <Tag>phone</Tag>
  </Tags>
</Product>

Example output JSON

{
  "name": "iPhone",
  "category": "phones",
  "cost": 4000,
  "tags": ["apple", "phone"]
}

lstkz commented 4 years ago

DONE No-fly zone api todo: Create a system for checking disallowed zones for drones. Two endpoints:

Add no-fly zone - add a polygon zone or circle.
Check point - check whether a given point (lat, long) belongs to any no-fly zone.

lstkz commented 4 years ago

Basic Calculator frontend todo: Create a basic calculator that will show the result in real-time. Support operations: +, -, *, / Support parentheses: (, ) Detect division by 0

lstkz commented 4 years ago

DONE Filter with predictions frontend todo: Create a filter with many options. If a filter option is not selected it should show the number (e.g. Red (10)) representing the total results if this option will be applied.

lstkz commented 4 years ago

DONE Like text formatter frontend todo: Create a text formatter for like button. It should format proper text based on conditions:

is liked by me
is liked by friends
is liked by other people

lstkz commented 4 years ago

filter serialized in query string frontend todo: create a filter and save its state automatically in the query string

lstkz commented 4 years ago

Inventory navigation frontend todo: create a grid, put items with a given dimension, and implement proper keyboard navigation. When navigating it should highlight a proper cell or an item.

lstkz commented 4 years ago

HTTP request canceling fronted todo: a simple form with two buttons: 'fetch', and 'cancel'. There should be two versions, one for fetch, and other for XHR.

lstkz commented 4 years ago

Update list values with debouncing frontend todo: display a list, each item has an input. When entering a value, it should call an API, and display some result in another cell. When entering multiple values, it should cancel previous request. There should be an also debouncing implemented.

lstkz commented 4 years ago

Conflict resolver fullstack todo: create a simple CRUD. When updating an item, check if there were edits by another user, and display a proper warning. Options: 'overwrite', 'ignore', 'merge'.

It can be split into two challenges, the hard version will be with merging.

lstkz commented 4 years ago

Chaotic case api backend create an endpoint that can accept multiple formats: pascal case, camel case, snake case

lstkz commented 4 years ago

PESEL solver

Create a UI that has 11 inputs. Users can enter any digits from the PESEL. Generate 10 example PESEL numbers that are valid.

lstkz commented 4 years ago

DONE ~~Input pin form~~

Create a form that will have 4 separate inputs. Each input can accept only 1 digit, when entering a value, it will focus the next input. If all digits are entered, display pin as a text.

lstkz commented 4 years ago

nested accordions persist expanded/collapsed state of child accordions or reset them

lstkz commented 4 years ago

masked input Implement masked input for mobile phone

lstkz commented 4 years ago

cached view list

there are two pages
when opening the page for the first time, show a loader and call the API to get items
when re-opening the page (page A -> page B -> page A), show items immediately from the cache, and call the API in the background, if there are changes, display the latest items

lstkz commented 4 years ago

Profile redirect User can create a profile and change username. If username is changed then GET /:username should still return the old profile. If a new profile is registered then it shouldn't redirect.

lstkz commented 4 years ago

Device info Display device info and its status. Status is an integer with flags (0x1, 0x2, 0x4) that but be formatted properly.

lstkz commented 4 years ago

Date entries grouping Given a list of items. Each item has a date. Groups item by date (day, month, year). Group type can be changed in the dropdown.

lstkz commented 4 years ago

Parallel requests

display a list of items
each item can be selected
click on button Process
make parallel requests to API, but max 3 requests at the same time
if the request is failed, retry
display live counter: X processes, Y retried

lstkz commented 4 years ago

Shared id sequence

two resources Issue, Pull Request
create simple CRUD for both
they share the same ID sequence (similar to github issues)

lstkz commented 4 years ago

tenant sequence

create a simple crud
provide x-tenant id in the header
ID sequence should be separated for all tenants

lstkz commented 4 years ago

scroll restoration

Navigate between two pages
Each page contains a container with big height
when using the back/forward buttons, the scroll should be restored
when clicking on links, the scroll should be reset to 0

lstkz commented 4 years ago

Ticket webhook notifications

add a simple CRUD for Tickets/Issues. Fields: title, desc, tags
add an endpoint for webhook registration
A webhook should receive information if the ticket was updated (with diff fields) or deleted

lstkz commented 4 years ago

Hierarchy manager (full stack)

create user crud with role hierarchy
hierarchy can be from level 1 to level 5
level 1 is the higher level
user can view/edit other users that below to the same hierarchy or lower
level 1 can view/edit level 1, level 2, ... level 5
level 4 can view/edit level 4, level 5
level 5 can view/edit only level 5
user entity has the following fields: username, first name , last name
show a user table with pagination
pre-create users with from given json

lstkz commented 4 years ago

Modal trap

two buttons
open two models with different buttons, inputs
implement focus trap

lstkz commented 4 years ago

Mobile filter

create a filter in the right side
if mobile, show only x filters active
if mobile, show filter in a modal

lstkz commented 4 years ago

User category blacklist

CRUD for categories
A User can blacklist a category, with or without children categories
create an endpoint for checking if the category is blacklisted

lstkz commented 4 years ago

Anagram API

create a route for setting a list of questions
each question has a list of letters
create a route for answering, user must provide a real word
word must be validated based on dictionary
calculate result

lstkz commented 4 years ago

Bracket surrounding

input with text,
when selecting the text, pressing ( or {, will surround the text and insert ) or } at the end of surrounding text.

lstkz commented 4 years ago

back/forward navigation caching

menu with two pages
when clicking on menu item, show page, and a loader
when clicking back/forward button navigate to the page but show previous results

lstkz commented 4 years ago

Bus seat reservation

Create an API for seat reservations on a bus.
There are multiple pools of prices.
Seats sold early are cheap, and it's getting more expensive.

lstkz commented 4 years ago

~~Duplicated layout names~~

add a layout name
if the name is duplicated, append -2
display the created names

lstkz commented 4 years ago

duplicated quick filters

allow selecting quick filters 'no photo', 'has photo', 'has access', 'no access',
if filters are duplicated from the same group, remove the previous selected version

lstkz / practice.dev

challenge ideas #5