My discoveries:
print : echo bare text
p: print object as it as, with new line
puts: echo text with new line
alias create alias for existing method, var
ensure always executed at block termination
block comment
=begin
=end
undef remove function definition
convention:
Eg: eql?
method with a question mark return a bool value
Eg: delete! (bang symbol)
method with exclamation ! indicates that it's destructive: change object than a copy
Eg: name=
method ends with = is a setter
block can be wrapped by "do .. end" or { }
run by "yield"
Check for existence via if block_given?
:symbol
storage optimized string
Global names is from Kernel module
replace string once:
string['search']= 'replace'
replace all
string.gsub 'search', 'replace'
regex
string[/regex/]
regex replace uses the same syntax
string.split(/, /) you might guess
Object methods:
obj.to_s
obj.class
string.to_sym -> :symbol
num_string.to_i -> integer
range.to_a -> array
%w[ string1, ... ]
%i [ symbol1, ...]
[num1, ... ]
array << x # Add x to array (immuttable)
set operator: intersect &, diffeence -, union |
array.join sep
array.shift
Hash.new(default_value)
hash.key?
hash.value?
hash.keys
hash.values
