hewigovens

#!/bin/sh
SDK=`dirname $0`
SCRIPT=`basename $0`
SDKPARENT=`dirname $SDK`
DEVROOT=`xcode-select --print-path`
SDKVER=`xcodebuild -showsdks | grep iphoneos | awk '{print $2}' | tail -n 1`
SDKROOT="$DEVROOT/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS$SDKVER.sdk"
SDKsROOT="$DEVROOT/Platforms/iPhoneOS.platform/Developer/SDKs"

PLATFORM=`uname -sp`

hewigovens

Updates without submitting to App Store

This is allowed for ReactNative apps. Source

AppHub.io is one option, open source coming soon.

Building a ReactNative app with Swift

See facebook/react-native#2648

hewigovens

/*
	pipe_source.m
	
	clang pipe_source.m -o pipe -framework Foundation -D [ USE_SOURCE | USE_IO | USE_FILEHANDLE [ FILEHANDLE_READABILITY | FILEHANDLE_WAIT ] ]
 */

#import <Foundation/Foundation.h>

int main(void) {
	enum RunLoop {

hewigovens

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

hewigovens

const bitcoinjs = require('bitcoinjs-lib') // @3.3.2
const bchaddrjs = require('bchaddrjs')
const bip39 = require('bip39')
const clone = require('lodash.clonedeep')

const networks = bitcoinjs.networks
const script = bitcoinjs.script

/*
Bitcoin   0x0488b21e - xpub   0x0488ade4 - xprv   P2PKH or P2SH