Ruby: Knowledge Base

ruby_knowledge.md

Ruby

Inspect

• debugger
• Docs

stock = StockQuote::Stock.quote("fb")
stock.inspect

Nil or?

a = nil
b = []
c = ""

a.blank? #=> true
b.blank? #=> true
c.blank? #=> true

d = "1"
e = ["1"]

d.blank? #=> false
e.blank? #=> false

Hash

• ugly

:locals => { :label => "About", :path => "about" }

• the same

locals: { label: "Home", path: "" }

require, include, extend and load

• include: include method from module as instance method
• extend: include method from module as static method
• require: load libraries only once
• load: load lobraries, may load many times.

References

• Ruby Blocks