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Ruby

Write expressive Ruby with blocks, metaprogramming, and idiomatic patterns.

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版本1.0.1

安全通过

技能说明

Topic	File
Mutable strings, object equality	`objects.md`
Proc vs lambda, return behavior	`blocks.md`
Visibility, method_missing	`methods.md`
Array/hash mutation traps	`collections.md`
define_method, eval traps	`metaprogramming.md`
ActiveRecord, N+1, callbacks	`rails.md`

Strings are mutable — s = "hi"; s << "!"; t = s means t also has "!"
== vs equal? vs eql? — == value, equal? identity, eql? hash equality
Default hash value is shared — Hash.new([]) shares same array, use block form
return in proc returns from enclosing method — use lambda for local return
Block variable shadows outer scope — x = 1; [2].each { |x| }; x is still 1 (3.0+)
method_missing without respond_to_missing? — breaks respond_to? checks
private in Ruby is per-object — self.private_method fails, implicit receiver works
||= doesn't work for false/nil distinction — false ||= true replaces false
Frozen string literals — # frozen_string_literal: true makes strings immutable
Symbol#to_proc — &:method_name only works with no-argument methods
rescue => e without type — catches StandardError, not Exception
ensure always runs — even after return, use for cleanup