7flash

var crypto = require('crypto');
var secret = crypto.randomBytes(24);

function encrypt(plaintext) {
    var cipher = crypto.createCipher('aes-128-cbc', secret);
    cipher.setAutoPadding(false);
    var ciphertext = '';
    for (var i=0; i < plaintext.length; i+=16) {
        ciphertext += cipher.update(plaintext.substr(i, i+16), 'utf8', 'base64');
    }

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<?php
$file = file_get_contents('aes.txt');
$data = json_decode($file);
$orig = $data->data;
$key = pack('H*', "3dbb8dd8a8b153e9f1aaab6d657e01c2");
$result = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, '3dbb8dd8a8b153e9f1aaab6d657e01c2', $orig, MCRYPT_MODE_CBC, base64_decode($data->iv));
echo $result;

7flash

Nodej in deep

This article is for those who have basic knowledge of javascript

Javascript aside

Javascript thinks you should know to make sure you understand nodejs properly

7flash

function* sequence() {
    let i = 0;
    while(++i) {
        yield i;
    }
}

for(let item of sequence()) {
    console.log(item);
}

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var co = require('co');

function getResult(item) {
    return new Promise((resolve, reject) => {
       setTimeout(() => {
           resolve(item * 2);
       }, 100);
    });
}

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var co = require('co');

let items = [1,2,3];

function* getResult(item) {
    return new Promise((resolve, reject) => {
        setTimeout(() => resolve(item * 2), 100);
    });
}

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var co = require('co');

function getResult(item) {
    return new Promise((resolve, reject) => {
        setTimeout(() => {
            if(item > 5) {
                reject('Break! Last page reached.');
            } else {
                resolve(item * 2);
            }

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var request = require('request');
var cheerio = require('cheerio');
var co = require('co');

function parse(url) {
    // Make promise from calback
    return new Promise((resolve, reject) => {
        request({url}, function(error, response, body) {
            if(error) return reject(error);

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// NodeJS
const assert = require('assert');

/**
 * Flatten an array of arbitrarily nested arrays of integers into a flat array of integers.
 * e.g. [[1,2,[3]],4] -> [1,2,3,4]. 
 * 
 * @name flatten
 * @param {Array} arr An array to flatten, nested or otherwise
 * @returns {Array} the flattened array

7flash

pragma solidity ^0.4.24;

interface IToken {
  function name() external view returns(string);

  function symbol() external view returns(string);

  function decimals() external view returns(uint8);

  function totalSupply() external view returns (uint256);