hamzaahmed742 Hamzaahmed742

Answers to Deep Questions about Solidity

The following list of questions was taken from https://www.reddit.com/r/ethereum/comments/72reba/do_you_have_deep_questions_about_solidity_or_the/

An updated summary on the different ways one could have two contracts interact (DELEGATECALL, STATICCALL, libraries, all that stuff) with clear pros/cons for each (gas cost, whether it requires EVM assembly directives, etc)

Question by /u/drcode

I won't talk about low-level opcodes here because of the brevity of the answer. In general, there are four ways functions can be called in Solidity:

Full socket.io client and server example

To see a full explanation, read my answer on SO here: https://stackoverflow.com/a/24232050/778272.

How to use

Create a folder, run npm init -f on it and paste both server.js and client.js there (see files below). Needless to say, you must have Node.js installed on your system.

Install the required libraries:

	var flattenObject = function(ob) {
	var toReturn = {};

	for (var i in ob) {
	if (!ob.hasOwnProperty(i)) continue;

	if ((typeof ob[i]) == 'object') {
	var flatObject = flattenObject(ob[i]);
	for (var x in flatObject) {
	if (!flatObject.hasOwnProperty(x)) continue;

	const express = require('express')
	var couchbase = require('couchbase')
	var cluster = new couchbase.Cluster('couchbase://ip/');
	cluster.authenticate('Username', 'password');
	var TokenLab_bucket = cluster.openBucket('bucket name')
	var Snapshot_bucket = cluster.openBucket('bucket name')
	var Web3 = require('web3');
	const fs = require('fs');
	var keythereum = require("keythereum");
	var key = require('./UTC.json');