hynkle

I wanted to output a list of single-line strings, each item separated by a newline. I couldn't find a way to do that without combining them all into a single string. Fine.

Reasonable attempt:

osascript -e '
set myList to {"foo", "bar", "baz"}
set myString to ""
repeat with myItem in myList
 set myString to myString & myItem & return

hynkle

Background:

• 'frozen' in Ruby means 'immutable'.
• Strings are not frozen by default. I.e., 'foo'.frozen? is false.

Question: {'foo' => true}.keys.first.frozen?
Answer: true

Okay. I can totally see why you don't want hash keys to be mutable. That's completely sensible.

Question: {[] => true}.keys.first.frozen?

hynkle

In my codebase, I've got something like the following, where Foo, Bar, and Baz are classes:

case o
when Foo then process!
when Bar then trash!
when Baz then flag!
else raise ArgumentError, "unexpected type #{o.class}"
end

hynkle

I do not like the way Ruby does its constant name resolution.

Suppose somewhere in your codebase you define a module Parent:

module Parent
  FOO = "foo"
end

And some other place, you add a method onto a module inside Parent called Child:

hynkle

I'd always assumed that alias_method(new, existing) was equivalent to something like the following (plus support for passing arguments and a block along):

def new
  existing
end

But no, apparently it really does just give you another name with which you can refer to the same method body. Thus:

hynkle

Given an otherwise empty Rails app with the following two models:

# app/models/cities/massachusetts/boston.rb

class Cities::Massachusetts::Boston

  def self.refer_to_denver
    begin
      Colorado::Denver

hynkle

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hynkle

#!/usr/bin/env node

var flatJSON = '';

process.stdin.on('data', function(data) {
  flatJSON = flatJSON + data;
});
process.stdin.on('end', function() {
  prettyJSON = JSON.stringify( JSON.parse(flatJSON), null, 2 )
  console.log(prettyJSON);

hynkle

# for those times you want to bubble an exception up, but want to put it in a different exception class

module Kernel
  def raise_as(exception_class)
    raise if $!.nil?
    raise exception_class, $!.message, $!.backtrace
  end
end

hynkle

error: refusing to create funny ref 'refs/master' remotely