PJUllrich

Big-O Time Complexities for Elixir data structures

Map [1]

Operation	Time Complexity
Access	O(log n)
Search	O(log n)
Insertion	O(n) for <= 32 elements, O(log n) for > 32 elements [2]
Deletion	O(n) for <= 32 elements, O(log n) for > 32 elements

mindflayer

import argparse
import json
import os
import subprocess


ENCODING = "utf-8"


def check_output(cmd, split_lines=False):

uobikiemukot

package main

import (
	"bufio"
	"bytes"
	"fmt"
	"image"
	"image/jpeg"
	_ "image/png"
	"io"

miguelmota

package ciphers

import (
	"crypto/rand"
	"crypto/rsa"
	"crypto/sha512"
	"crypto/x509"
	"encoding/pem"
        "log"
)

nikneroz

Elixir + Phoenix Framework + Guardian + JWT + Comeonin

Preparing environment

We need to generate secret key for development environment.

mix phoenix.gen.secret
# ednkXywWll1d2svDEpbA39R5kfkc9l96j0+u7A8MgKM+pbwbeDsuYB8MP2WUW1hf

Let's generate User model and controller.

simonw

How to recover lost Python source code if it's still resident in-memory

I screwed up using git ("git checkout --" on the wrong file) and managed to delete the code I had just written... but it was still running in a process in a docker container. Here's how I got it back, using https://pypi.python.org/pypi/pyrasite/ and https://pypi.python.org/pypi/uncompyle6

Attach a shell to the docker container

Install GDB (needed by pyrasite)

apt-get update && apt-get install gdb

chalmagean

# Install https://github.com/rubencaro/cipher first
require Cipher.Helpers, as: H

defmodule Enc do
  @random_key H.env(:keyphrase) |> Cipher.Digest.generate_key

  def stream_encrypt(xml) do
    {_, result} =
      :crypto.stream_init(:rc4, @random_key)
      |> :crypto.stream_encrypt(xml)

sid24rane

#include <stdio.h>
#include <stdbool.h>
#include <string.h>

#define MAX_SIZE 100

struct Stack{
    int top;
    char arr[MAX_SIZE];
} st;

moeseth

from pydub import AudioSegment
from matplotlib import pyplot as plot
from PIL import Image, ImageDraw
import numpy as np
import os

src = "./test.mp3"

audio = AudioSegment.from_file(src)
data = np.fromstring(audio._data, np.int16)

sirex

import sqlalchemy as sa
import sqlparse

metadata = sa.MetaData()

tasks = sa.Table(
    'tasks', metadata,
    sa.Column('id', sa.Integer, primary_key=True),
    sa.Column('bot', sa.String(255), nullable=False),
    sa.Column('task', sa.String(255), nullable=False),