Jellyfishboy

Update server

sudo apt-get update

sudo apt-get dist-upgrade

Install system monitoring

Jellyfishboy

Dos

2.hours.ago # => Thu, 27 Aug 2015 14:39:36 AFT +04:30
1.day.from_now # => Fri, 28 Aug 2015 16:39:36 AFT +04:30
Time.zone.parse("2015-08-27T12:09:36Z") # => Thu, 27 Aug 2015 16:39:36 AFT +04:30
Time.current # => Thu, 27 Aug 2015 16:39:36 AFT +04:30
Time.current.utc.iso8601 # When supliyng an API ("2015-08-27T12:09:36Z")
Time.strptime("2015-08-27T12:09:36Z", "%Y-%m-%dT%H:%M:%S%z").in_time_zone # If you can’t use Time.zone.parse (Thu, 27 Aug 2015 16:39:36 AFT +04:30)
Date.current # If you really can’t have a Time or DateTime for some reason (Thu, 27 Aug 2015)

Jellyfishboy

{
       "orderNumber" => 1,
     "customerEmail" => "[email protected]",
  "customerUsername" => "[email protected]",
         "orderDate" => "2016-09-14 12:33:55",
       "paymentDate" => "2016-09-14 12:33:55",
       "orderStatus" => "awaiting_shipment",
            "billTo" => {
           "name" => "Wanda Predovic",
        "company" => "",

Jellyfishboy

Update server

sudo yum update

Install system monitoring

sudo yum install htop

Jellyfishboy

.nil? can be used on any object and is true if the object is nil.

.empty? can be used on strings, arrays and hashes and returns true if:

• String length == 0
• Array length == 0
• Hash length == 0

Running .empty? on something that is nil will throw a NoMethodError.