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‎demo/README.md‎

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Demo of ethereum software
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These video's give demos of how to use the ethereum tools. ([Up](..) [Home](..\..))
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- [MetaMask](#metamask)
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- [Ethereum play](#ethereum-play)
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- [Remix](#remix)
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- [RPC API](#rpc-api)
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- [Others](#others)
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# MetaMask
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| Object | Instance
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| --------------- | ---------
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| Athereum and metamask | [Athereum and metamask](Athereum_and_metamask.html)
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# Ethereum play
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| Object | Instance
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| --------------- | ---------
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| Play - hello example | [Play - hello example](Play_hello_example.html)
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| Play - Transfer eth | [Play - Transfer eth with contract](Play_Transfer_eth_with_contract.html)
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| Play - oracle | [Play - Provable Temperature Oracle](Play_Provable_Temperature_Oracle.html)
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| Play - ERC20 token | [Play - ERC20](Play_ERC20.html)
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| Play - Deploy contract ERC721 | [Play - Deploy contract ERC721](Play_Deploy_contract_ERC721.html)
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| Play - Check ERC721 interface | [Play - Check ERC721 interface](Play_Check_ERC721_interface.html)
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| Play - Mint one ERC721 token | [Play - Mint one ERC721 token](Play_Mint_one_ERC721_token.html)
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| Play - See ERC721 token in Metamask | [Play - See ERC721 token in Metamask](Play_See_ERC721_token_in_Metamask.html)
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| Play - Unibright | [Play - Unibright](Play_Unibright.html)
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| Play - Natspec | [Play - Natspec](Play_Natspec.html)
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# Remix
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| Object | Instance
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| --------------- | ---------
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| Remix - compile and use Casino | [Remix - compile and use Casino](Remix_compile_and_use_Casino.html)
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| Remix - deploy ropsten | [Remix - deploy ropsten](Remix_deploy_ropsten.html)
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| Remix - natspec | [Remix - natspec](Remix_natspec.html)
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| Remix - debug | [Remix - debug](Remix_debug.html)
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| Remix - ropsten - debug gas | [Remix - ropsten - debug gas](Remix_ropsten_debug_gas.html)
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# RPC API
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| Object | Instance
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| --------------- | ---------
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| Curl - Check contract balance | [Check contract balance via RPC-curl](Check_contract_balance_via_RPC_curl.html)
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| Check contract balance online | [Check contract balance via RPC-online](Check_contract_balance_via_RPC_online.html)
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| Websockets | [Use ganache-cli Windows WS](Use_ganache_cli_Windows_WS.html)
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| Subscriptions | [Use ganache-cli Windows WS Subscriptions](Use_ganache_cli_Windows_WS_Subscriptions.html)
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# Others
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| Object | Instance
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| --------------- | ---------
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| Test Eth | [Get Ropsten ETH via Faucet](Get_Ropsten_ETH_via_Faucet.html)
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| web3.js 0.2 | [Use web3 0.2 from chrome console with MetaMask](Use_web3_0.2_from_chrome_console_with_MetaMask.html)
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| web3.js 1.0 | [Use web3 1.0 from chrome console with MetaMask](Use_web3_1.0_from_chrome_console_with_MetaMask.html)
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| Load chain | [Load geth goerli windows](Load_geth_goerli_windows.html)
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| Publish source | [Publish on etherscan and interact](Publish_on_etherscan_and_interact.html)
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| Find ERC721 token in Opensea | [Find ERC721 token in Opensea](Find_ERC721_token_in_Opensea.html)
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| Piet - Unibright | [Piet - Unibright](Piet_Unibright.html)
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| Aragon - create company | [Aragon - create company](Aragon_create_company.html)
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| Create ERC20 via web | [Create ERC20 via web](Create_ERC20_via_web.html)
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| Geth Prometheus Grafana | [Geth Prometheus Grafana](Geth_Prometheus_Grafana.html)
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‎demo/a.txt‎

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function Test1(x) {
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console.log(x);
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}
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Test2 = y => console.log(y);
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Test1(1);
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Test2(2);
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(z => console.log(z))(3)
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// npm install node-fetch
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const fetch = require('node-fetch');
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async function asyncFunction() {
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const Response = await fetch('https://chainid.network/chains.json');
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const content = await Response.json();
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console.log(content[0].name);
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}
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asyncFunction();
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// npm install node-fetch
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const fetch = require('node-fetch');
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fetch('https://chainid.network/chains.json2')
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.then( Response => Response.json())
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.catch(err => console.error('Catch 1: fetch failed', err.message))
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.then( content => console.log(content[0].name))
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.catch(err => console.error('Catch 2: fetch failed', err.message))
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// const declarations are block scoped
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// const cannot be updated or re-declared
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const greeter = "hey hi";
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console.log(greeter)
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{
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const greeter = "new block now";
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console.log(greeter)
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}
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console.log(greeter)
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// let is block scoped
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let greeter = "hey hi";
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greeter = "say Hello instead";
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console.log(greeter)
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{
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const greeter = "new block now";
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console.log(greeter)
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}
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console.log(greeter){
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"requires": true,
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"lockfileVersion": 1,
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"dependencies": {
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"node-fetch": {
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"version": "2.6.0",
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"resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-2.6.0.tgz",
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"integrity": "sha512-8dG4H5ujfvFiqDmVu9fQ5bOHUC15JMjMY/Zumv26oOvvVJjM67KF8koCWIabKQ1GJIa9r2mMZscBq/TbdOcmNA=="
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}
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}
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}
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var x=1;
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var y=4;
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console.log(`x=${x} y=${y} x+y=${x+y}`);
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// npm install node-fetch
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const fetch = require('node-fetch');
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function StepThree(content) {
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console.log(content[0].name);
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}
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function StepTwo(Response) {
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Response.json().then(StepThree);
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}
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fetch('https://chainid.network/chains.json').then(StepTwo);
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// npm install node-fetch
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const fetch = require('node-fetch');
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fetch('https://chainid.network/chains.json')
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.then( Response => Response.json())
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.then( content => console.log(content[0].name))
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// var declarations are globally scoped or function scoped
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// var variables can be re-declared (in the same scope)
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// var variables are initialized with undefined
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var greeter = "hey hi";
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console.log(greeter)
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{
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var greeter = "new block now";
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console.log(greeter)
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}
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console.log(greeter)

‎demo/arrow.js‎

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function Test1(x) {
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console.log(x);
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}
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Test2 = y => console.log(y);
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Test1(1);
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Test2(2);
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(z => console.log(z))(3)
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‎demo/async.js‎

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// npm install node-fetch
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const fetch = require('node-fetch');
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async function asyncFunction() {
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const Response = await fetch('https://chainid.network/chains.json');
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const content = await Response.json();
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console.log(content[0].name);
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}
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asyncFunction();

‎demo/b.txt‎

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arrow.js
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async.js
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catch.js
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const.js
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let.js
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template_literal.js
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then.js
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then_arrow.js
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var.js

‎demo/catch.js‎

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// npm install node-fetch
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const fetch = require('node-fetch');
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fetch('https://chainid.network/chains.json2')
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.then( Response => Response.json())
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.catch(err => console.error('Catch 1: fetch failed', err.message))
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.then( content => console.log(content[0].name))
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.catch(err => console.error('Catch 2: fetch failed', err.message))
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‎demo/const.js‎

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// const declarations are block scoped
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// const cannot be updated or re-declared
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const greeter = "hey hi";
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console.log(greeter)
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{
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const greeter = "new block now";
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console.log(greeter)
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}
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console.log(greeter)

‎demo/let.js‎

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// let is block scoped
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let greeter = "hey hi";
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greeter = "say Hello instead";
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console.log(greeter)
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{
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const greeter = "new block now";
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console.log(greeter)
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}
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console.log(greeter)

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