lottery | a quite simple lottery game

I'm trying to learn how to use the pandas library.

For the data source, I use the lottery combinations draws so far.

One of many tasks I'm trying to solve is to count the frequency of pairs of numbers in combinations.

I create a data frame from the list like this:

Thanks to Patrick and after reading the Chainlink's blog on how to build blockchain lottery, I am eager to build a similar "version". It will be using the latest Chainlink's version of VRFv2 and Keeper.

However, the supported test networks for VRFv2 and Keeper are Rinkeby and Kovan, respectively.

So any hint on how to approach this?

I am trying to get my smart contract to transfer all its balance to another address. The transfer line doesn't throw any errors but the balance of contract does not change afterwards.

I am using web3js with ganache to test this function:

My contract:

im trying to get a diffrent values of the array and print them each time the user clicking the button.

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This is the problem from my last interview as following:

Q. (Constrained randomization) Consider the lottery rules on this page

• Given the set of six numbers that will win the jackpot as input, try and implement the constraint to generate a set of numbers that wins the second-highest award, matching exactly 5 numbers out of the six jackpot numbers.

The Following are my code link to EDA playground:

Test Bench:

I have created a lottery contract where I have stored all participated players in an address array I am getting errors while transferring my contract money to the winner i.e in function winner another error is while converting hash value to uint

I have a small canonical lottery search form comprising of 6 input fields. Currently when the user backspaces once, it will remove the value and move to the previous input field.

I need to split the above process into two steps. Therefore one backspace removes the value, the second backspace moves to previous input field and repeat.

How can I achieve this by adding to my current jquery if/else statement?

I tried all that you mentioned in the discussion here (in other questions) and at https://github.com/smartcontractkit/full-blockchain-solidity-course-py/discussions/522 , however it is not solving the issue for me, I also noticed that the current compiler version remains (current compiler is 0.6.12+commit.27d51765.Windows.msvc). But when I right click and select Solidty:Compiler information, it shows 0.8.0.

from output:

I have a lottery search form which concatenate six input fields into a single value and returns the ticket results based on the position. My form works correctly for numbers 1-9, but it is unable to display results when I search for 0.

I believe this is because within my get_numbers() function, the value of '0' is being treated as empty: https://www.php.net/manual/en/function.empty.php

How can I fix my if else statement to stop it treating 0 as empty?