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package main

import (
	"crypto/sha256"
	"encoding/json"
	"fmt"
	"strconv"
	"strings"
	"time"
)

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from hashlib import sha256
import json
from time import time

class Block:

    def __init__(self, timestamp=None, data=None):
        self.timestamp = timestamp or time()
        self.data = [] if data is None else data

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React Hooks Cheatsheet

useState Hook

The useState hook allows us to create state variables in a React function component.

Create State Variables with useState

import { useState } from 'react';

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const https = require('https');

https.get('https://jsonplaceholder.typicode.com/posts', response => {
  
  let data = [];
  
  const hdrDate = response.headers
                  && response.headers.date 
                  ? response.headers.date : 'no response date';

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Ruby on Rails cheatsheet

Ruby on Rails Keywords

alias	defined?	FILE	not	then
and	do	for	or	true
BEGIN	else	if	redo	undef

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Javascript Cheatsheet

Data Types

let age = 28; // Number

let name = "Joe"; // string

let name = { // object
  firstName : "Joe", 

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Ruby Cheatsheet

General Syntax

• Comments start with a pound character, and go to the end of the line
• For multi-line comments use "=begin" and "=end"
• Expressions are finished with a semi-colon, followed by a new line
• Including a backslash () at the end of a line does not terminate the expression

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PHP Cheatsheet

Including PHP in a file

<?php
    // place PHP code here
?>

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Axios

Axios is a promise based HTTP client for the browser and Node. Axios makes it easy to send asynchronous HTTP requests to REST API endpoints and perform CRUD (create,read,update,delete) operations. It can be used in vanilla plain JavaScript or with a library such as Vue or React.

Installing Axios

• npm: npm install axios
• pnpm: pnpm install axios
• bower: bower install axios

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cURL tool usage, tips, and usage as an alternative to Postman

cURL is a transfer tool used to transfer data from or to a server. It supports various internet protocols of transfer, including: DICT, FILE, FTP, FTPS, GOPHER, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS, POP3, POP3S, RTMP, RTSP, SCP, SFTP, SMB, SMBS, SMTP, SMTPS, TELNET and TFTP. Using cURL one can perform useful tricks with cURL like proxy support, user authentication, FTP upload, HTTP post, SSL connections, cookies, file transfer resume, Metalink, and more.

cURL options

--request or -X

--request and -X specify a custom request method you can use when communicating with the HTTP server. The specified request method will be used instead of the method otherwise used (which defaults to GET).