fokusferit

Shallow

Real unit test (isolation, no children render)

Simple shallow

Calls:

• constructor
• render

chicoxyzzy

function nonCoercible(val) {
  if (val == null) {
    throw TypeError('nonCoercible shouldn\'t be called with null or undefined');
  }
  const res = Object(val);
  res[Symbol.toPrimitive] = () => {
    throw TypeError('Trying to coerce non-coercible object');
  }
  return res;
};

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))

paulirish

What forces layout / reflow

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.

Element APIs

Getting box metrics

• elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent

laispace

git config --global https.proxy http://127.0.0.1:1080

git config --global https.proxy https://127.0.0.1:1080

git config --global --unset http.proxy

git config --global --unset https.proxy


npm config delete proxy

Dirrk

#!/bin/bash
# Install daemon tools
if [ "$UID" -ne 0 ]
  then echo "Please run as root"
  exit
fi
if [ ! -e /usr/bin/gcc ] || [ ! -e /usr/bin/make ]; then
  echo gcc or make not installed going to install dev tools in 5 seconds press ^C to exit
  sleep 6
  yum -y groupinstall 'Development Tools'

LeCoupa

/* *******************************************************************************************
 * THE UPDATED VERSION IS AVAILABLE AT
 * https://github.com/LeCoupa/awesome-cheatsheets
 * ******************************************************************************************* */


// 0. Synopsis.
// http://nodejs.org/api/synopsis.html

fankay

常用的数字正则（严格匹配）
------------------------------
  正则                                              含义
^[1-9]\d*$	                                        匹配正整数
^-[1-9]\d*$	                                        匹配负整数
^-?[1-9]\d*$	                                    匹配整数 
^[1-9]\d*|0$	                                    匹配非负整数（正整数 + 0）
^-[1-9]\d*|0$	                                    匹配非正整数（负整数 + 0）
^[1-9]\d*\.\d*|0\.\d*[1-9]\d*$	                    匹配正浮点数
^-([1-9]\d*\.\d*|0\.\d*[1-9]\d*)$	                匹配负浮点数

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

dperini

//
// Regular Expression for URL validation
//
// Author: Diego Perini
// Created: 2010/12/05
// Updated: 2018/09/12
// License: MIT
//
// Copyright (c) 2010-2018 Diego Perini (http://www.iport.it)
//