bmaupin

See also:

• Free backend hosting
• https://free-for.dev/#/?id=dbaas

Service	Type	Storage	Limitations
Amazon DynamoDB	⚠️ Proprietary NoSQL	25 GB	⚠️ Payment method required
Amazon RDS	⚠️ Proprietary RDBMS		⚠️ Only free for 1 year
Azure SQL Database	MS SQL Server		⚠️ Only free for 1 year
👉 Clever Cloud	PostgreSQL, MySQL, MongoDB, Redis	256 MB (PostgreSQL)	Max 5 connections (PostgreSQL)

faressoft

Javascript Deep Dive

This document is written to help JavaScript developers to understand JavaScript's weird parts deeply and to prepare for interviews, the following resources was really helpful to write this document:

• ECMAScript 6 Language specification
• ECMAScript 5 Language specification
• MDN
• The Modern JavaScript Tutorial

General Notes

msalahat

let match_arabic = (user_input, word) => {
    let user_input_regx = "";
    for (let d = 0; d < user_input.length; d++) {
        //البحث عن أ، ا ، آ و إ
        let hamz_letters = ["أ", "ا", "آ", "إ"].join("|")
        const hamz_regx = new RegExp(hamz_letters);
        if (hamz_regx.test(user_input.charAt(d))) {
            user_input_regx += "[" + hamz_letters + "]";
        } else {
            user_input_regx += user_input.charAt(d);

mjalajel

# Example ssh config file. Usually located in ~/.ssh/config (user) or /etc/ssh/ssh_config (system)
# This works on both linux and MacOS

# Basic ssh commands converted to ssh/config file format



# Simplest format
# Run with: "ssh blog" => (equivalent to: "ssh ubuntu@example.com" and  "ssh -i ~/.ssh/id_rsa -p 22 ubuntu@example.com")
Host blog

ljharb

Array Iteration

https://gist.github.com/ljharb/58faf1cfcb4e6808f74aae4ef7944cff

While attempting to explain JavaScript's reduce method on arrays, conceptually, I came up with the following - hopefully it's helpful; happy to tweak it if anyone has suggestions.

Intro

JavaScript Arrays have lots of built in methods on their prototype. Some of them mutate - ie, they change the underlying array in-place. Luckily, most of them do not - they instead return an entirely distinct array. Since arrays are conceptually a contiguous list of items, it helps code clarity and maintainability a lot to be able to operate on them in a "functional" way. (I'll also insist on referring to an array as a "list" - although in some languages, List is a native data type, in JS and this post, I'm referring to the concept. Everywhere I use the word "list" you can assume I'm talking about a JS Array) This means, to perform a single operation on the list as a whole ("atomically"), and to return a new list - thus making it mu

shagunsodhani

GloVe: Global Vectors for Word Representation

Introduction

• Introduces a new global log-bilinear regression model which combines the benefits of both global matrix factorization and local context window methods.

Global Matrix Factorization Methods

• Decompose large matrices into low-rank approximations.

rraallvv

var fs = require('fs');
var copy = function(srcDir, dstDir) {
    var results = [];
    var list = fs.readdirSync(srcDir);
	var src, dst;
    list.forEach(function(file) {
        src = srcDir + '/' + file;
		dst = dstDir + '/' + file;
		//console.log(src);
        var stat = fs.statSync(src);

syafiqfaiz

1. Change your database RDS instance security group to allow your machine to access it.
   • Add your ip to the security group to acces the instance via Postgres.
2. Make a copy of the database using pg_dump
   • $ pg_dump -h <public dns> -U <my username> -f <name of dump file .sql> <name of my database>
   • you will be asked for postgressql password.
   • a dump file(.sql) will be created
3. Restore that dump file to your local database.
   • but you might need to drop the database and create it first
   • $ psql -U <postgresql username> -d <database name> -f <dump file that you want to restore>

• the database is restored

vasanthk

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

robwormald

Angular2 + JSPM cheat sheet

First time setup

• install jspm beta: npm install -g jspm@beta
• set up your project: jspm init
• install dependencies: jspm install angular2 reflect-metadata zone.js es6-shim

This will create a jspm_packages folder, and a config.js file.

Open the config.js file - this file manages options for the System.js loader - tweak it as appropriate