Ruby Strings
symbol what it does + concatenate << append * repetition [] indexing <=> comparison, returns -1 for less, 0 for…
Execute shell script from within ruby
1) Use the “system” method system “ls” 2) Or use backticks. Note that backticks support you returning to the results…
Ruby function to check if something is a number
def is_a_number?(s) s.to_s.match(/\A[+-]?\d+?(\.\d+)?\Z/) == nil? false : true end
List of Ruby Operands
operand what it does shift position of bits in Bignum and Fixnum ~ bitwise NOT (high-presendence) & bitwise AND (medium-presendence)…
Tips for Working with Rails
Go to script/console to open ruby in interactive mode. script/console loads your environments (everything in environment.rb and all your plugin…
Methods ending with an equal sign? (Ruby basics)
A method defined on a model that ends with = is an assignment method, so when ActiveRecord is trying to…
Emulated ruby tags (ERB) tags
Some handy information about working with those less-than-percent sign things that appear in Emulated Ruby, or .rhtml files. example what…