skplunkerin

When running a Rails project locally that needs SSL support you might get the following type of error:

... Puma compiled without SSL support (RuntimeError)

Here's how to fix it:

SO answer

skplunkerin

NOTE: JSON files don't normally allow comments, but VSCode allows them in .vscode/launch.json.

TODO:

• Add debug config for React/JS-HTML-CSS projects in the browser

skplunkerin

[WIP] Docker Cheatsheets

• Other resources:

  • Quick graphic cheatsheets by @collabnix

• Table of Contents:

  • The docker-compose.yml file
  • The Dockerfile file
  • CLI Commands

• Working with Images

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Deploy Instructions

1. Go to https://remix.ethereum.org

2. Click on the Deploy & run transactions on the left navigation

3. Choose the MultiSigWallet contract in the CONTRACT dropdown

4. Paste the following in the Deploy input, then click Deploy:

   ["0x5B38Da6a701c568545dCfcB03FcB875f56beddC4", "0xAb8483F64d9C6d1EcF9b849Ae677dD3315835cb2", "0x4B20993Bc481177ec7E8f571ceCaE8A9e22C02db"], 2
   

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Project Requirements

– Anyone should be able to deposit ether into the smart contract

– The contract creator should be able to input the following (in the constructor) :

1. the addresses of the owners
2. the number of approvals required for a transfer

For example, input 3 addresses and set the approval limit to 2.

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// See feedback: https://gist.github.com/skplunkerin/61fe0562a72016162aece7b22609fb62

pragma solidity 0.8.7;

contract MemoryAndStorage {

    struct User{
        uint id;
        uint balance;
    }

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pragma solidity 0.8.7;

contract HelloWorld {
    // called state variables:
    // string message;
    
    // CONSTRUCTORS
    // https://academy.moralis.io/lessons/constructors-2
    // runs only 1x during compile.
    // constructor(string memory _msg){

skplunkerin

An empty struct struct{} uses 0 memory:

More on it here https://dave.cheney.net/2014/03/25/the-empty-struct.

It can be used with channels as well if you just want to notify whatever is listening on a channel that something happened and not to transfer data between goroutines.

// DO NOT DO THIS: (it uses more memory)
func removeDuplicateUsers(users []User) []User {
	u := map[string]bool{}

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Source

Only 555-0100 through 555-0199 are now specifically reserved for fictional use; the other numbers have been reserved for actual assignment.

skplunkerin

VS Code GO - Delve error:

NOTE: /.../ is the full path to my project.

Error message:

could not launch process: open /.../cmd/server/debug.test: no such file or directory
could not remove /.../cmd/server/debug.test: remove /.../cmd/server/debug.test: no such file or directory
Process exiting with code: 1