From: nobu@... Date: 2016-11-23T03:17:28+00:00 Subject: [ruby-core:78269] [Ruby trunk Feature#12968] Allow default value via block for Integer(), Float() and Rational() Issue #12968 has been updated by Nobuyoshi Nakada. Only "invalid value for Integer()" from a string? `Integer` can raise exceptions other than `ArgumentError` against a string, for example. ```ruby Integer(nil) #=> can't convert nil into Integer (TypeError) Integer(Object.new) #=> can't convert Object into Integer (TypeError) Integer(Object.new, 2) #=> base specified for non string value (ArgumentError) Integer("", 1) #=> invalid radix 1 (ArgumentError) X=Struct.new(:to_i) Integer(X.new("a")) #=> can't convert #X to Integer (X#to_i gives String) (TypeError) ``` ---------------------------------------- Feature #12968: Allow default value via block for Integer(), Float() and Rational() https://bugs.ruby-lang.org/issues/12968#change-61635 * Author: Stefan Sch����ler * Status: Open * Priority: Normal * Assignee: ---------------------------------------- `Kernel` provides the global conversion functions `Integer()`, `Float()` and `Rational()`. Each one convert its argument to the respective type. Parsing errors are signaled by raising a `TypeError` or an `ArgumentError`. I often use these methods to parse numeric string values, but I find the need for a `rescue ArgumentError` block quite annoying an distracting. I therefore request a new feature: `Integer()`, `Float()` and `Rational()` should take an _optional block_ that serves as a callback when parsing failed. Examples: ```ruby Integer('foo') #=> ArgumentError (just as before) Integer('foo') { 0 } #=> 0 (same as 'foo'.to_i) Integer('foo') { nil } #=> nil Integer('foo') { Float::NAN } #=> NaN ``` This resembles the way `Hash#fetch` or `Hash#fetch_values` work when a block is given. Although not used in the examples above, any arguments should be passed along to the block, i.e. `Integer('foo') { |arg, base| ... }` -- https://bugs.ruby-lang.org/ Unsubscribe: