Simple ones javascript const [a, b, ...c] = [10, 20, 100,200] // a= 10, b=20, c=[100,200] const { first, second } = { first: 1, second: 2 } // first = 1, second = 2

Crazier one javascript const resp = { data: { message: 'hello', random: 'xxx', test:'hehe' } } const { data, data: { message, ...rest } = resp // data = { message: 'hello' }, message = 'hello' // rest = { random: 'xxx', test: 'hehe' }

$ git diff develop feature/one-signal --diff-filter=M --name-only -- *.rb | egrep -v 'db|config|spec' | xargs rubocop

You might be using dig to find out A/CNAME/MX etc records of a domain from DNS servers. But if you just want to get a quick overview, use host:

$ host oozou.com
oozou.com has address 52.89.55.136
oozou.com has address 35.165.206.160
oozou.com has address 34.212.209.65
oozou.com mail is handled by 1 aspmx.l.google.com.
oozou.com mail is handled by 5 alt1.aspmx.l.google.com.
oozou.com mail is handled by 5 alt2.aspmx.l.google.com.
oozou.com mail is handled by 10 aspmx2.googlemail.com.
oozou.com mail is handled by 10 aspmx3.googlemail.com.

If you want to attach a file you generated on disk or downloaded from a user-submitted URL, you can do it like this.

@model.image.attach(
    io: File.open('/path/to/file'),
  filename: 'file.pdf',
  # content type is optional
  content_type: 'application/pdf'
)

:w !sudo tee %

Add this to your .zshrc

lst() {
    if [ "$1" != "" ] # or better, if [ -n "$1" ]
    then
        ls -R $1 | grep ":$" | sed -e 's/:$//' -e 's/[^-][^\/]*\//--/g' -e 's/^/   /' -e 's/-/|/'
    else
        ls -R | grep ":$" | sed -e 's/:$//' -e 's/[^-][^\/]*\//--/g' -e 's/^/   /' -e 's/-/|/'
    fi
}

Then you can run

$ lst spec

It should list all sub directory in spec folder in tree format.

You could change spec to any path you want.

or just use tree

<3

sudo scutil --set HostName "New Name" 

sudo scutil --set LocalHostName "New Name"

sudo scutil --set ComputerName "New Name"

dscacheutil -flushcache 

Ever wanted to shorten a git command? You can go with shell alilas for sure but you have to always include context so that you don't forget what each ailas stands for but you can define your own commands in git using aliases.

git config --global alias.  

For example; I'm too lazy to type git status so I want to shorten this to git s

git config --global alias.s status

And here we go now you can just type git s and get the status of current repository.

Open term (or equivalent) and paste the following:

S3 copy

• to upload a world-readable file:

aws s3 cp source.file s3://bucket/path/dest.file --acl public-read

Options for --acl parameters are:

• private - visibility to owner only
• public-read - readable by all
• public-read-write - readable and writable by all

The Rails 5 attributes API allows us to build form objects very easily.

I had previously been using an after_initialize callback to downcase emails, with the following code I can define an :email date type and values are automatically cast when set.

This has the advantage of casting subsequent calls to set the email value.

class EmailType < ActiveModel::Type::String
  def cast(value)
    return super unless value.is_a?(String)
    super(value.downcase)
  end
end

ActiveModel::Type.register(:email, EmailType)

class Foo
  include ActiveModel::Model
  include ActiveModel::Attributes

  attribute :email, :email
end

> Foo.new(email: 'EMAIL@MAIL.com').email
=> 'email@mail.com'