intro
- strings are a sequences of characters.
- the name comes from the fact that the characters are strung together.
string format
- single quoted ('string') : basic string, faster than double quoted.
- double quoted ("string") : support interpolation and escape sequences.
- back quoted (`string`): execute as command in bin/rails folder.
- other.%q quoted (%q(foo bar): string without interpolation.
- other.%Q quoted (%Q(foo #{bar})): string with interpolation.
fancy way
- concate: 'foo' << 'bar'
- multiply: 'foo' * 1000
- 'aaa'.next #=> 'aab'
- '111'.next #=> '112'
search methods
- check whether a string contains any given character or substring.
- e.g.: #include?, #start_with?. #end_with?, #index, etc...
case change methods
- e.g.: #upcase, #downcase, #swapcase, #capitalize, etc...
split methods
- split strings by particular characters.
- e.g. combine #split and regex to operate.
- like split strings on newlines, and parse date in csv.
concatenate methods
- create new string by adding two string together.
- efficiency: '<<' same as '#concat' better than '+'
- << and #concat change the original string object.
replace substring
- first search for substrings or use regex.
- e.g.: #sub(a, b); #gsub(a, b); #gsub(/regex/, b);
- regex are a concise and flex means for 'matching' strings.
- if you want to implement a parser, #match might be a good friend :P
chop and chomp
- todo
