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function useSelectors(reducer, mapStateToSelectors) { | |
const [state] = reducer; | |
const selectors = useMemo(() => mapStateToSelectors(state), [state]); | |
return selectors; | |
} | |
function useActions(reducer, mapDispatchToActions) { | |
const [, dispatch] = reducer; | |
const actions = useMemo(() => mapDispatchToActions(dispatch), [dispatch]); | |
return actions; |
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/* global chrome, MediaRecorder, FileReader */ | |
chrome.runtime.onConnect.addListener(port => { | |
let recorder = null | |
port.onMessage.addListener(msg => { | |
console.log(msg); | |
switch (msg.type) { | |
case 'REC_STOP': | |
console.log('Stopping recording') | |
if (!port.recorderPlaying || !recorder) { |
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// Copyright 2017, the Flutter project authors. Please see the AUTHORS file | |
// for details. All rights reserved. Use of this source code is governed by a | |
// BSD-style license that can be found in the LICENSE file. | |
import 'dart:math'; | |
import 'package:flutter/material.dart'; | |
void main() { | |
runApp(new MyApp()); | |
} |
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section .text | |
global _start ;must be declared for linker (ld) | |
_start: ;tell linker entry point | |
mov rdi, filename | |
mov rsi, 0102o ;O_CREAT, man open | |
mov rdx, 0666o ;umode_t | |
mov rax, 2 | |
syscall |
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vec2 rotate(vec2 v, float a) { | |
float s = sin(a); | |
float c = cos(a); | |
mat2 m = mat2(c, s, -s, c); | |
return m * v; | |
} |
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# set the base image to Debian | |
# https://hub.docker.com/_/debian/ | |
FROM debian:latest | |
# replace shell with bash so we can source files | |
RUN rm /bin/sh && ln -s /bin/bash /bin/sh | |
# update the repository sources list | |
# and install dependencies | |
RUN apt-get update \ |
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function mapValues(obj, fn) { | |
return Object.keys(obj).reduce((result, key) => { | |
result[key] = fn(obj[key], key); | |
return result; | |
}, {}); | |
} | |
function pick(obj, fn) { | |
return Object.keys(obj).reduce((result, key) => { | |
if (fn(obj[key])) { |
All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.
Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.
elem.offsetLeft
,elem.offsetTop
,elem.offsetWidth
,elem.offsetHeight
,elem.offsetParent
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# install openjdk | |
sudo apt-get install openjdk-7-jdk | |
# download android sdk | |
wget http://dl.google.com/android/android-sdk_r24.2-linux.tgz | |
tar -xvf android-sdk_r24.2-linux.tgz | |
cd android-sdk-linux/tools | |
# install all sdk packages |
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