tsemerad

Improving times for both iOS build and CI for a React Native app

Intro

Hello there.

So, if you are here you probably saw my previous tweet where I asked for tips & tricks on improving the timing on an iOS/React Native app build time.

What will follow was how I mixed those suggestions + some good old GoogleSearch-fu + me deep diving on this for ~2 days.

Motivation

expression-oriented programming one of the great advances of FP
expressions plug together like legos, making more malleable programming experience in-the-small

Examples

Write in an expression-oriented style, scoping variables as locally as possible:

Make a backup from RDS

pg_dump -h <rds host> -p 5432 -F c -O -U <rds user> <db name> > db.dump

Restore the backup into a Docker container

docker run --rm --interactive --link <postgres container id>:postgres --volume $PWD/:/tmp/ postgres:latest /bin/bash -c 'pg_restore --verbose --clean --no-acl --no-owner -h "$POSTGRES_PORT_5432_TCP_ADDR" -p "$POSTGRES_PORT_5432_TCP_PORT" -U postgres -d <db name> /tmp/db.dump'

	package com.example.sample.offline

	import android.util.Log
	import java.io.BufferedReader
	import java.io.ByteArrayOutputStream
	import java.io.FileNotFoundException
	import java.io.PrintStream
	import java.net.ServerSocket
	import java.net.Socket
	import kotlin.math.pow

	import Foundation
	import Mapbox
	import SQLite

	// MARK: MbtilesSource

	enum MBTilesSourceError: Error {
	case CouldNotReadFileError
	case UnknownFormatError
	case UnsupportedFormatError

	/! adminTaskFunction.js \| Samuel Jones 2017 \| MIT License \| github.com/samthecodingman /

	/**
	* @file Defines a helper class to create Firebase Functions that handle recurring tasks that are triggered using the Firebase Realtime Database.
	* @author Samuel Jones (github.com/samthecodingman)
	*/

	const functions = require('firebase-functions')
	const lodashGet = require('lodash').get;

	import React, { Component, PropTypes } from 'react';
	import ReactDOM from 'react-dom';

	import cx from 'classnames';

	import { FormGroup, ControlLabel, FormControl, HelpBlock, InputGroup } from 'react-bootstrap';

	export default class Input extends Component {
	static propTypes = {
	name: PropTypes.string,

	var Col = require('react-bootstrap/lib/Col')
	var PageHeader = require('react-bootstrap/lib/PageHeader')
	var React = require('react')
	var Row = require('react-bootstrap/lib/Row')
	var {connect} = require('react-redux')
	var {reduxForm} = require('redux-form')

	var DateInput = require('./DateInput')
	var FormField = require('./FormField')
	var LoadingButton = require('./LoadingButton')