I don’t quite understand the question you are asking. I mean, you have already given the answer yourself, before even asking the question: && binds tighter than = while and binds less tightly than =. So, in the first case, the expression is evaluated as follows: ( a=f(2) ) and ( b=f(4) ) ( a= … Read more
This is extremely easy to test: class MyCache def initialize @hash = {} end def []=(key, value) puts “Cache key ‘#{key}’ written” @hash[key] = value end def [](key) puts “Cache key ‘#{key}’ read” @hash[key] end end Now simply try the ||= syntax: cache = MyCache.new cache[“my key”] ||= “my value” # cache value was nil … Read more
Instead of a client_secret in your request body, you need a client_assertion. This is a bit more complex, but it’s the reason you need that certificate. Basically you need to build a JSON Web Token and sign it with your certificate using a SHA256 hash. The token is going to look something like this: Header: … Read more
You can do this with Ruby2Ruby which implements a to_ruby method. require ‘rubygems’ require ‘parse_tree’ require ‘parse_tree_extensions’ require ‘ruby2ruby’ def meth &block puts block.to_ruby end meth { some code } will output: “proc { some(code) }” I would also check out this awesome talk by Chris Wanstrath of Github http://goruco2008.confreaks.com/03_wanstrath.html He shows some interesting ruby2ruby … Read more
Two ways of achieving duplicate keys in a hash: h1 = {} h1.compare_by_identity h1[“a”] = 1 h1[“a”] = 2 p h1 # => {“a”=>1, “a”=>2} h2 = {} a1 = [1,2,3] a2 = [1,2] h2[a1] = 1 h2[a2] = 2 a2 << 3 p h2 # => {[1, 2, 3]=>1, [1, 2, 3]=>2}
Double-quoted strings support the full range of escape sequences, as shown below: \a Bell/alert (0x07) \b Backspace (0x08) \e Escape (0x1b) \f Formford (0x0c) \n Newline (0x0a) \r Return (0x0d) \s Space (0x20) \t Tab (0x09) \v Vertical tab (0x0b) For single-quoted strings, two consecutive backslashes are replaced by a single backslash, and a backslash … Read more
It’s the Ruby 1.9 “stabby lambda” operator. For example, see this article from 2008. Nutshell: > foo2 = ->(arg) { arg * 2 } > foo2.call “now” => nownow Note the lack of space between -> and (arg), that’s intentional.
As long as you are working on a POSIX OS you can use fork and exec. fork = Create a subprocess exec = Replace current process with another process You then need to inform that your main-process is not interested in the created subprocesses via Process.detach. job1 = fork do exec “/path/to/daemon01” end Process.detach(job1) …
Answer Use a positive lookbehind regular expression (i.e. ?<=) inside a parenthesis capture group to keep the delimiter at the end of each string: content.split(/(?<=[?.!])/) # Returns an array with: # [“Do you like to code?”, ” How I love to code!”, ” I’m always coding.”] That leaves a white space at the start of … Read more
The answer is both Yes and No. You can achieve the same result as you can in other languages using a variety of mechanisms including: Default values for arguments Variable Argument lists (The splat operator) Defining your argument as a hash The actual syntax of the language does not allow you to define a method … Read more