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@rekmarks
rekmarks / newProvider.js
Last active April 18, 2021 17:06
Using the New MetaMask Inpage Provider
// Running on the page, in the browser
// This API will go live in early 2020
// It will be the only API available after a 6-week deprecation period
if (!ethereum || !ethereum.isMetaMask) {
throw new Error('Please install MetaMask.')
}
/*********************************************************/
" Specify a directory for plugins
call plug#begin('~/.vim/plugged')
Plug 'neoclide/coc.nvim', {'branch': 'release'}
Plug 'scrooloose/nerdtree'
"Plug 'tsony-tsonev/nerdtree-git-plugin'
Plug 'Xuyuanp/nerdtree-git-plugin'
Plug 'tiagofumo/vim-nerdtree-syntax-highlight'
Plug 'ryanoasis/vim-devicons'
Plug 'airblade/vim-gitgutter'
@laughinghan
laughinghan / Every possible TypeScript type.md
Last active May 8, 2024 11:14
Diagram of every possible TypeScript type

Hasse diagram of every possible TypeScript type

  • any: magic, ill-behaved type that acts like a combination of never (the proper [bottom type]) and unknown (the proper [top type])
    • Anything except never is assignable to any, and any is assignable to anything at all.
    • Identities: any & AnyTypeExpression = any, any | AnyTypeExpression = any
    • Key TypeScript feature that allows for [gradual typing].
  • unknown: proper, well-behaved [top type]
    • Anything at all is assignable to unknown. unknown is only assignable to itself (unknown) and any.
    • Identities: unknown & AnyTypeExpression = AnyTypeExpression, unknown | AnyTypeExpression = unknown
  • Prefer over any whenever possible. Anywhere in well-typed code you're tempted to use any, you probably want unknown.
pragma solidity ^0.6.0;
import "https://github.com/smartcontractkit/chainlink/evm-contracts/src/v0.6/ChainlinkClient.sol";
// MyContract inherits the ChainlinkClient contract to gain the
// functionality of creating Chainlink requests
contract ChainlinkExample is ChainlinkClient {
// Stores the answer from the Chainlink oracle
uint256 public currentPrice;
address public owner;
@gnurgeldiyev
gnurgeldiyev / api.js
Last active November 25, 2023 07:58
How to get the response time from Axios
const axios = require('axios').default
const API_BASE_URL = 'https://api.spacexdata.com/v3'
const API = axios.create({
baseURL: API_BASE_URL
})
/*
* setting interceptors to be able
* to know response time of the each request
@itzmeanjan
itzmeanjan / ChildERC20.sol
Last active July 6, 2021 06:43
An illustration of sending data from Ethereum root chain to Matic child chain
// File: contracts/child/ChildToken/ChildERC20.sol
pragma solidity 0.6.6;
contract ChildERC20 is
ERC20,
IChildToken,
AccessControlMixin,
NativeMetaTransaction,
ChainConstants,
@cryptoscopia
cryptoscopia / dydxFlashLoanTemplate.sol
Created October 21, 2020 06:42
A single-file simplest possible template for a contract that obtains a flash loan from dydx, does things, and pays it back.
// SPDX-License-Identifier: AGPL-3.0-or-later
// The ABI encoder is necessary, but older Solidity versions should work
pragma solidity ^0.7.0;
pragma experimental ABIEncoderV2;
// These definitions are taken from across multiple dydx contracts, and are
// limited to just the bare minimum necessary to make flash loans work.
library Types {
enum AssetDenomination { Wei, Par }
@spalladino
spalladino / falsehoods-that-ethereum-programmers-believe.md
Last active May 20, 2024 21:04
Falsehoods that Ethereum programmers believe

Falsehoods that Ethereum programmers believe

I recently stumbled upon Falsehoods programmers believe about time zones, which got a good laugh out of me. It reminded me of other great lists of falsehoods, such as about names or time, and made me look for an equivalent for Ethereum. Having found none, here is my humble contribution to this set.

About Gas

Calling estimateGas will return the gas required by my transaction

Calling estimateGas will return the gas that your transaction would require if it were mined now. The current state of the chain may be very different to the state in which your tx will get mined. So when your tx i

@fuadnafiz98
fuadnafiz98 / transparent.vim
Last active April 18, 2023 07:26
vim transparent background
" for transparent background
function! AdaptColorscheme()
highlight clear CursorLine
highlight Normal ctermbg=none
highlight LineNr ctermbg=none
highlight Folded ctermbg=none
highlight NonText ctermbg=none
highlight SpecialKey ctermbg=none
highlight VertSplit ctermbg=none
highlight SignColumn ctermbg=none
set-option -g prefix C-g
unbind-key C-g
bind-key C-g send-prefix
set -g default-terminal "screen-256color"
set -ga terminal-overrides ",*256col*:Tc"
set-option -g status-position bottom
set -g base-index 1