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sudo rm -rf $(xcode-select -print-path)
xcode-select --install
/usr/sbin/pkgutil --packages | grep CL
sudo npm install -g node-gyp

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# https://github.com/pyenv/pyenv/issues/108

CFLAGS="-I$(xcrun --show-sdk-path)/usr/include" pyenv install -v 3.6.8

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# BUILD FAILED (OS X 10.14.5 using python-build ...)
# zipimport.ZipImportError: can't decompress data; zlib not available

brew install zlib
export LDFLAGS="-L/usr/local/opt/zlib/lib"
export CPPFLAGS="-I/usr/local/opt/zlib/include"
export PKG_CONFIG_PATH="/usr/local/opt/zlib/lib/pkgconfig"
export KEEP_BUILD_PATH=true

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# VirtualBox
# 1. add network adapter
# 2. select: host-only
# 3. select: vboxnet0


# centos

cd /etc/sysconfig/network-scripts/
cp ifcfg-enp0s3 ifcfg-enp0s8

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array1.length === array2.length && array1.sort().every(function(value, index) { return value === array2.sort()[index]});

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def lower(obj):
    return obj.lower()

def lower_dict(obj):
    return _recursive_key_op(obj, lower)

def _recursive_key_op(obj, op=None):
    if isinstance(obj, dict):
        return {op(k): _recursive_key_op(v, op) for k, v in obj.items()}
    elif isinstance(obj, (list, set, tuple)):

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# from http://flask.pocoo.org/docs/1.0/cli/

# Setting Command Options

# Click is configured to load default values for command options from environment variables. The variables use the pattern FLASK_COMMAND_OPTION. For example, to set the port for the run command, instead of flask run --port 8000:

export FLASK_RUN_PORT=8000
flask run
 * Running on http://127.0.0.1:8000/

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// https://redux.js.org/recipes/writing-tests
// https://facebook.github.io/jest/docs/en/webpack.html

npm i -D jest babel-jest transform-es2015-modules-commonjs


// package.json
{
    ...
    "jest": {

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// https://stackoverflow.com/questions/34614812/error-in-index-js-module-build-failed-syntaxerror-unexpected-token#34619867

// .babelrc

{
  "presets": [
    "react",
    "env"
  ],
  "plugins": [

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rsvg-convert img.svg > img.png
rsvg-convert -h 256 img.svg > img.png