Rails magic ; and <=>

Asked Aug 11 '14 at 12:20

Active Aug 11 '14 at 12:20

Viewed 72 times

I'm new to Rails and I'm studying Redmine. I see 2 magic function definitions as below:

  def to_s; name end

and 2.

  def <=>(tracker)
    position <=> tracker.position
  end

I cannot understand, please explain what is ";" in "to_s;" and what is "<=>"

Thank you

asked Aug 11 '14 at 12:20

vietstone

1

btw, 1 has no magic, its just a method written on one line, and `;` is used as separator – apneadiving Aug 11 '14 at 12:23
thank you, I understand now – vietstone Aug 11 '14 at 12:26
Hint: `def foo` defines a method named `foo`. `def bar` defines a method named `bar`. `def <=>` defines a method named … can you guess? – Jörg W Mittag Aug 11 '14 at 15:51
`<=>` is the comparison operator for performing sorts. If you have a collection of these and call sort it will use this method to compare the two objects. – CWitty Aug 11 '14 at 17:33

0 Answers0