From: andrew@... Date: 2016-01-30T02:04:08+00:00 Subject: [ruby-core:73591] [Ruby trunk - Feature #11848] New #to_b method for String, Symbol, Numeric, NilClass, TrueClass and FalseClass. Issue #11848 has been updated by Andrew Vit. I've had to do this in a few places over the years myself: ~~~ TRUTHY_VALUES = [true, 1, '1', 't', 'T', 'true', 'TRUE', 'y', 'Y', 'yes', 'YES'] FALSY_VALUES = [false, 0, '0', 'f', 'F', 'false', 'FALSE', 'n', 'N', 'no', 'NO'] ~~~ > You forgot empty string/array/hash to be false. ;-) I think the main reason for this is handling user input (from a file like CSV or other), so other types like Array/Hash are not expected there: just basic scalar values. Still, it probably only makes sense for some specific situations. ---------------------------------------- Feature #11848: New #to_b method for String, Symbol, Numeric, NilClass, TrueClass and FalseClass. https://bugs.ruby-lang.org/issues/11848#change-56786 * Author: Fernando Hamasaki de Amorim * Status: Rejected * Priority: Normal * Assignee: Yukihiro Matsumoto ---------------------------------------- New ***to_b*** method converts **strings**, **symbols**, **numbers** and **nil** values in a **boolean** value. ***to_b*** method is available on ***String***, ***Symbol***, ***Numeric***, ***TrueClass***, ***FalseClass*** and ***NilClass*** classes. ## String Returns ***true*** if string is one of **t**, **true**, **on**, **y**, **yes** or **1** values. Returns ***false*** otherwise. Ignores trailing spaces and letter cases. ~~~ruby 't'.to_b # => true 'true'.to_b # => true 'on'.to_b # => true 'y'.to_b # => true 'yes'.to_b # => true '1'.to_b # => true ''.to_b # => false '0'.to_b # => false '2'.to_b # => false '-1'.to_b # => false 'f'.to_b # => false 'false'.to_b # => false 'off'.to_b # => false 'n'.to_b # => false 'no'.to_b # => false 'wherever'.to_b # => false ~~~ ## Symbol Same as ***symbol.to_s.to_b***. ~~~ruby :'1'.to_b # => true :t.to_b # => true :true.to_b # => true :on.to_b # => true :y.to_b # => true :yes.to_b # => true :f.to_b # => false :false.to_b # => false :off.to_b # => false :n.to_b # => false :no.to_b # => false :wherever.to_b # => false ~~~ ## Numeric Returns ***false*** if number is **zero**. Returns ***true*** otherwise. ### Integer ~~~ruby 0.to_b # => false 1.to_b # => true 2.to_b # => true -1.to_b # => true -2.to_b # => true ~~~ ### Float ~~~ruby 0.0.to_b # => false 0.1.to_b # => true 1.0.to_b # => true -0.1.to_b # => true -1.0.to_b # => true ~~~ ### BigDecimal ~~~ruby require 'bigdecimal' BigDecimal('0.0').to_b # => false BigDecimal('0.1').to_b # => true BigDecimal('1.0').to_b # => true BigDecimal('-0.1').to_b # => true BigDecimal('-1.0').to_b # => true ~~~ ## NilClass Returns ***false***. ~~~ruby nil.to_b # => false ~~~ ## TrueClass Returns ***true***. ~~~ruby true.to_b # => true ~~~ ## FalseClass Returns ***false***. ~~~ruby false.to_b # => false ~~~ ---Files-------------------------------- to_b_method.diff (9.63 KB) -- https://bugs.ruby-lang.org/ Unsubscribe: