kickstarter | Landing pages we created to help our kickstarter succeed | RecyclerView library
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Landing pages we created to help our kickstarter succeed.
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QUESTION
I understand that smart contracts are converted into bytecode and stored on a block in the blockchain. Smart contracts could be used similarly to Kickstarter. A project team might set a funding goal that would only be paid out if backers donate enough money to meet the goal.
But how does the the smart contract know when to pay the project team? A block's hash changes wildly depending on its data. So, keeping track of the amount of donations and transaction IDs inside a block should not be possible because it would change the block's hash. Therefore, how does the smart contract know how much money has been funded, and how does it remember where to donations the money to if the funding goal is not met?
Is it true that there is a ledger (or blockchain) and also a state database? If so, I'm assuming that we store values associated with a smart contract on the state database.
...ANSWER
Answered 2021-May-18 at 13:14Bytecode of a smart contract is published in a transaction (that is mined in a block), and then stored in a storage of the network (usually Ethereum or Binance Smart Chain) associated with an address.
So each time when you're interacting with a smart contract, you're interacting with an address that is associated with a storage chunk containing the bytecode. Plus the bytecode points to other storage slots where the values of its variables are stored.
All state changes (including changes of the storage values) are part of the ledger database. The raw blockchain data only contain the state changes (not the current state), but most higher layers return the current state by default (you can still chose to fetch an older state, e.g. the "defaultBlock" param here). And some layers even disallow accessing previous states (e.g. Solidity and Vyper languages for writing smart contracts - you can compile this code to the bytecode).
But how does the the smart contract know when to pay the project team?
A smart contract can access current balance of any address, including its own. It can also have a variable containing the funding goal. Comparing these two values tells you whether the goal has been reached and whether the smart contract should pay the project team.
However, smart contracts currently don't have any native timers (such as cronjobs) or event handlers - and functions are executed after a transaction is sent to the address of the smart contract (data
field of the transaction states what function you want to execute and what arguments you're passing).
So you need to either send the transaction (executing the withdraw()
function) manually or using some offchain tool (that can watch the current balance and then send the transaction executing the function for you).
QUESTION
For a school project I'm working on the kickstarter dataset on Kaggle; https://www.kaggle.com/kemical/kickstarter-projects
In the "name" variable there's a few titles that have spaces in between them; e.g. instance 373 "C R O S S T O W N".
I've been working on some regex all day to re.sub the extra spaces and try to get it to look as a normal word. Though I think this is a problem that occurs more often, most regex content is to add spaces, or add double-spaces. Never this specific task.
I've tried a couple of ways to describe the exact kind of space that needs te be deleted, single out the characters to keep as a group, and using them as the replace string. Though it looks like it should be working, my data doesn't change.
- long regex expression written to identify words that are written as spaces + single capitals (tried a couple of different ones for this)
- r'\2\4' refers to the second and fourth group (the first and second alphabetic character)
ANSWER
Answered 2021-May-15 at 16:32If your target is only to remove spaces from words, am not sure if you really need regex.
You can use simple replace() function like this:
QUESTION
I'm attempting to write a C# application with a generic class, targeting ESP32. When launching the debugger, the Visual Studio nanoFramework extension's debug process appears to be stuck in an infinite loop at the "Loading Deployment Assemblies" step.
Here's the output I see in the VS2019 debug window:
...ANSWER
Answered 2021-May-02 at 17:24Generics support it's on the works. Currently the only missing piece is adding support of it in the VS debugger library. We plan to tackle that soon.
QUESTION
I'm having a weird issue with a new installation of xgboost. Under normal circumstances it works fine. However, when I use the model in the following function it gives the error in the title.
The dataset I'm using is borrowed from kaggle, and can be seen here: https://www.kaggle.com/kemical/kickstarter-projects
The function I use to fit my model is the following:
...ANSWER
Answered 2021-May-02 at 14:44xgboost library is currently under updating to fix this bug, so the current solution is to downgrade the library to older versions, for me I have solved this problem by downgrading to xgboost v0.90
Try to check your xgboost version by cmd:
QUESTION
I want to build deep learning classifiers for Kickstarter campaign prediction. I have a problem with the part of the model but I can not solve this.
My code:
...ANSWER
Answered 2021-May-02 at 01:50you need to add an embedding layer at the top of your NN to kind of vectorize words. something like this:
QUESTION
I am trying to change the text in the heading with the animation. however, I tried several ways but the animation always starts at 50% the content below 50% shows blank. I don't know whether I am conveying it properly this is my first time in stack overflow. Any help would be appreciated thank you.
...ANSWER
Answered 2021-Mar-31 at 07:14Well, adding ;
at the end of every CSS rule seems to work.
QUESTION
I am "playing" with graphql-java
and the related kickstarter servlet, modifying it to build the schema programmatically based on the types I discover automatically. The documentation is (almost) there but is outdated in spots and references deprecated methods. My particular issue is that the GraphQLFieldDefinition.Builder
has four variants of the type(...)
method - three accepting various (other) builders and one accepting the GraphQLOutputType
, none of which I may have. Furthermore, those that accept builder actually invoke the build()
method on those builders so I am anxious to pass any of my "unfinished" type builders either. I thought of defining all types upfront with no fields at all, then add fields to them after that but if build()
gets called on these at that point in time, even if they don't get into an unwanted state today I can see how a future update may demand at most a single build()
invocation.
So the question is how does one declare a field to yet-undefined or not fully defined type? For example, an Employee
's manager
field being itself of the Employee
type such as:
ANSWER
Answered 2021-Mar-18 at 21:35As I noted in my comments, instead of attempting to (directly) use the builder or the built type one should create an instance of GraphQLTypeReference
instead like so:
QUESTION
Running brew doctor
the output is too long for the shell. Below is what I can still reach.
Any idea what the warning (or error) for these might be and how to fix it?
Some system info:
...ANSWER
Answered 2021-Mar-12 at 01:53Try doing brew update-reset
. Do make a note of the following, however:
QUESTION
I'm trying to delete an item from array of objects. But it deletes for a while but once I again click on it. It gets back. I just cant seem to update the array. Seems like it removes once but again gets the same data back. Example of error has been posted in the above gif.
Menu.js
...ANSWER
Answered 2021-Mar-11 at 13:13In App.js
QUESTION
I just started to code, and I followed a tutorial video for a coding in javascript. However, the console shows that I have "Uncaught TypeError: Cannot set property 'innerHTML' of null at app.js:97." I don't understand why. I checked for typos, but there seemed to be none. I hope you guys know why this error keeps coming up. Thanks.
...ANSWER
Answered 2021-Feb-24 at 09:27const sectionCenter = document.querySelector(".section-center");
is the valid statement since section-center
is a class. You're trying to access it as a tag like div
.
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