jboner

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

akshay1188

- (UIImage *)compressImage:(UIImage *)image{
    float actualHeight = image.size.height;
    float actualWidth = image.size.width;
    float maxHeight = 600.0;
    float maxWidth = 800.0;
    float imgRatio = actualWidth/actualHeight;
    float maxRatio = maxWidth/maxHeight;
    float compressionQuality = 0.5;//50 percent compression
    
    if (actualHeight > maxHeight || actualWidth > maxWidth) {

nicktoumpelis

git clean -xfd
git submodule foreach --recursive git clean -xfd
git reset --hard
git submodule foreach --recursive git reset --hard
git submodule update --init --recursive

CodaFi

// Playground - noun: a place where people can play

public func id<A>(x : A) -> A {
	return x
}

public func error<A>(x : String) -> A {
	assert(false, x)
}

nolanlawson

// Promise.all is good for executing many promises at once
Promise.all([
  promise1,
  promise2
]);

// Promise.resolve is good for wrapping synchronous code
Promise.resolve().then(function () {
  if (somethingIsNotRight()) {
    throw new Error("I will be rejected asynchronously!");

tobiassteenweg

extension String {
    
    func encodeURIComponent() -> String? {
        var characterSet = NSMutableCharacterSet.alphanumericCharacterSet()
        characterSet.addCharactersInString("-_.!~*'()")

        return self.stringByAddingPercentEncodingWithAllowedCharacters(characterSet)
    }
}

vmlinz

Intro

• https://en.wikipedia.org/wiki/Comparison_of_free_software_e-commerce_web_application_frameworks
• https://www.djangopackages.com/grids/g/ecommerce/
• https://www.mindmeister.com/66865574/ecommerce-organization

List of open source ecommerce platforms

• https://www.magentocommerce.com/
• https://www.opencart.com/

DrBoolean

// http://www.haskellforall.com/2013/02/you-could-have-invented-comonads.html

const daggy = require('daggy');
const {toUpper, prop, identity, range, curry, compose} = require('ramda');

const Config = daggy.tagged("opts")

Config.prototype.inspect = function() {
  return `Config(${this.opts})`
}

Avaq

const I  = x => x
const K  = x => y => x
const A  = f => x => f (x)
const T  = x => f => f (x)
const W  = f => x => f (x) (x)
const C  = f => y => x => f (x) (y)
const B  = f => g => x => f (g (x))
const S  = f => g => x => f (x) (g (x))
const S_ = f => g => x => f (g (x)) (x)
const S2 = f => g => h => x => f (g (x)) (h (x))

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?