montanaflynn

Concurrency in JavaScript

Javascript is a programming language with a peculiar twist. Its event driven model means that nothing blocks and everything runs concurrently. This is not to be confused with the same type of concurrency as running in parallel on multiple cores. Javascript is single threaded so each program runs on a single core yet every line of code executes without waiting for anything to return. This sounds weird but it's true. If you want to have any type of sequential ordering you can use events, callbacks, or as of late promises.

montanaflynn

const crypto = require('crypto');

const password = 'password';

function encrypt(password, text) {
    const algorithm = 'aes-256-ctr';
    const key = Buffer.concat([Buffer.from(password), Buffer.alloc(32)], 32);
    const iv = crypto.randomBytes(16);
    const cipher = crypto.createCipheriv(algorithm, key, iv);
    let encrypted = cipher.update(text);

montanaflynn

var express = require('express')

var app = express()

app.listen(1337)

app.all('/stream/:chunks', function (req, res, next) {

  res.writeHead(200, {
    'Content-Type': 'text/plain',

montanaflynn

package main

import (
	"crypto/aes"
	"crypto/cipher"
	"encoding/hex"
	"fmt"
	"strings"
)

montanaflynn

package main

import (
	"fmt"
	"sync"
	"time"
)

func main() {

montanaflynn

package main

import (
	"fmt"
	"net/http"
	"sort"
	"time"
)

// a struct to hold the result from each request including an index

montanaflynn

package main

import (
	"context"
	"fmt"
	"io"
	"log"
	"net/http"
	"os"
	"time"

montanaflynn

package main

import (
	"context"
	"log"
	"net/http"
	"time"

	"github.com/gin-gonic/gin"
)

montanaflynn

# place this in your fish path
# ~/.config/fish/config.fish

function fish_greeting
        if not type fortune > /dev/null 2>&1
                apt-get install fortune
        end
        fortune -a
end

montanaflynn

package main

import (
	"context"
	"fmt"
	"log"
	"net/http"
	"sync"
	"time"
)