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function solution(A) {
  let result = 0;

  for (let element of A) {
    result ^= element
  }

  return result
}

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1. install watchman

$ brew install watchman

2. install jdk

brew tap AdoptOpenJDK/openjdk
brew cask install adoptopenjdk8

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$ /usr/local/bin/node -v
v13.7.0

$ sudo rm -rf /usr/local/{bin/{node,npm},lib/node_modules/npm,lib/node,share/man/*/node.*}

$ /usr/local/bin/node -v
zsh: no such file or directory: /usr/local/bin/node

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in chrome

$r.store
$r.store.getState()
$r.store.dispatch()

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Traceback (most recent call last):
  File "/usr/local/Cellar/pipenv/2018.11.26_2/libexec/bin/pipenv", line 6, in <module>
    from pkg_resources import load_entry_point
  File "/usr/local/Cellar/python/3.7.4/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pkg_resources/__init__.py", line 3241, in <module>
    @_call_aside
  File "/usr/local/Cellar/python/3.7.4/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pkg_resources/__init__.py", line 3225, in _call_aside
    f(*args, **kwargs)
  File "/usr/local/Cellar/python/3.7.4/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pkg_resources/__init__.py", line 3254, in _initialize_master_working_set
    working_set = WorkingSet._build_master()

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const print = (obj:any) => {
  console.log(JSON.stringify(obj, null, 4));
}

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#ifdef GL_ES
precision mediump float;
#endif

uniform float u_time;
uniform vec2 u_resolution;

uniform sampler2D u_tex0;

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vec<n>  --> float<n>
vec2 --> float2
vec3 --> float3

texture --> tex2D

u_time --> _Time.y

atan(x,y) --&gt; atan2(y,x)

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console.table

const foo = { id: 1, verified: true, color: 'green' };
const bar = { id: 2, verified: false, color: 'red' };
console.table({ foo, bar})

console.group

console.group('User Details');

koji

Setup

$ docker pull ubuntu
$ docker run --name ubuntu-xrdp -it ubuntu bash
inside docker
$ apt-get update -y
$ apt-get upgrade -y
$ apt-get install xrdp -y
$ apt-get install lxde
$ apt-get install net-tools