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necolas / Hoverable.js
Last active Apr 16, 2019
Hover styles in React Native for Web
View Hoverable.js
import createHoverMonitor from './createHoverMonitor';
import { element, func, oneOfType } from 'prop-types';
import React, { Component } from 'react';
const hover = createHoverMonitor();
* Use:
* <Hoverable>
* {(hover) => <View style={hover && styles.hovered} />}
kakadiadarpan /
Last active Dec 2, 2017
Different approaches to handling asynchronous Redux actions.

Async in Redux

This is a CFP for ReactiveConf open call for lightning talks. If you'd like to see this talk become a reality, please ⭐️ star this gist. #ReactiveConf

If you're on your phone, please request the desktop site to star this gist 😇

cvbuelow / reducers.js
Last active Jul 25, 2019 — forked from gaearon/reducers.js
Code splitting in Redux with SSR
View reducers.js
import { combineReducers } from 'redux';
import users from './reducers/users';
import posts from './reducers/posts';
// Inject the initial state for async loaded reducers
function injectState(reducers, preloadedState = {}) {
return Object.keys(reducers).reduce((finalReducers, key) => {
if (typeof reducers[key] === "function") {
finalReducers[key] = (state = preloadedState[key], action) => reducers[key](state, action);
gaearon / reducers.js
Last active Aug 20, 2019
How I'd do code splitting in Redux (pseudo code, not tested!)
View reducers.js
import { combineReducers } from 'redux';
import users from './reducers/users';
import posts from './reducers/posts';
export default function createReducer(asyncReducers) {
return combineReducers({
gillesdemey / querystring.swift
Last active Jul 8, 2019
Retrieve specific query string parameter from NSURL
View querystring.swift
func getQueryStringParameter(url: String, param: String) -> String? {
let url = NSURLComponents(string: url)!
(url.queryItems? as [NSURLQueryItem])
.filter({ (item) in == param }).first?
jboner / latency.txt
Last active Sep 19, 2019
Latency Numbers Every Programmer Should Know
View latency.txt
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
isaacs /
Last active Sep 19, 2019
Use one of these techniques to install node and npm without having to sudo. Discussed in more detail at Note: npm >=0.3 is *safer* when using sudo.
echo 'export PATH=$HOME/local/bin:$PATH' >> ~/.bashrc
. ~/.bashrc
mkdir ~/local
mkdir ~/node-latest-install
cd ~/node-latest-install
curl | tar xz --strip-components=1
./configure --prefix=~/local
make install # ok, fine, this step probably takes more than 30 seconds...
curl | sh
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