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https://github.com/prodis/wannabe_bool
If string, numeric, symbol and nil values wanna be a boolean value, they can with the new #to_b method (and more).
https://github.com/prodis/wannabe_bool
boolean conversion predicate-methods prodis ruby wannabe-bool
Last synced: 13 days ago
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If string, numeric, symbol and nil values wanna be a boolean value, they can with the new #to_b method (and more).
- Host: GitHub
- URL: https://github.com/prodis/wannabe_bool
- Owner: prodis
- License: mit
- Created: 2014-10-24T06:33:32.000Z (about 10 years ago)
- Default Branch: master
- Last Pushed: 2020-11-11T16:47:12.000Z (about 4 years ago)
- Last Synced: 2024-10-19T16:48:28.671Z (24 days ago)
- Topics: boolean, conversion, predicate-methods, prodis, ruby, wannabe-bool
- Language: Ruby
- Homepage:
- Size: 64.5 KB
- Stars: 160
- Watchers: 6
- Forks: 14
- Open Issues: 5
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- Contributing: CONTRIBUTING.md
- License: LICENSE
Awesome Lists containing this project
README
# Wannabe Bool
If **string**, **numeric**, **symbol** and **nil** values wanna be a **boolean** value, they can with the new `to_b` method.
Moreover, you can use `WannabeBool::Attributes` module to create predicate methods in your classes.
[](http://badge.fury.io/rb/wannabe_bool)
[](https://travis-ci.org/prodis/wannabe_bool)
[](https://coveralls.io/github/prodis/wannabe_bool?branch=master)
[](https://codeclimate.com/github/prodis/wannabe_bool)
[](https://gemnasium.com/prodis/wannabe_bool)
[](LICENSE)
## Installing
### Gemfile
```ruby
gem 'wannabe_bool'
```
### Direct installation
```
$ gem install wannabe_bool
```
## Using
`to_b` method is available on `String`, `Symbol`, `Numeric`, `TrueClass`, `FalseClass` and `NilClass`.
For sake of readability (and personal choice), `to_b` has two aliases:
- `to_bool`
- `to_boolean`
Given this example:
```ruby
{
one: 'value',
two: 2,
mobile?: params[:mobile].to_b
}
```
It could be "more readable" like this:
```ruby
{
one: 'value',
two: 2,
mobile?: params[:mobile].to_boolean
}
```
Don't forget to require the gem:
```ruby
require 'wannabe_bool'
```
### String
* Returns `true` if string is one of these values: **t**, **true**, **on**, **y**, **yes**, **1**.
* Returns `false` if string is one of these values: **f**, **false**, **off**, **n**, **no**, **0**.
* For invalid boolean string representations, returns `false` by default. See "Invalid Value Behaviour" section for more options.
It ignores trailing spaces and letter cases.
```ruby
'1'.to_b # => true
't'.to_b # => true
'T'.to_b # => true
'true'.to_b # => true
'TRUE'.to_b # => true
'on'.to_b # => true
'ON'.to_b # => true
'y'.to_b # => true
'yes'.to_b # => true
'YES'.to_b # => true
' 1 '.to_b # => true
' t '.to_b # => true
' T '.to_b # => true
' true '.to_b # => true
' TRUE '.to_b # => true
' on '.to_b # => true
' ON '.to_b # => true
' y '.to_b # => true
'Y'.to_b # => true
' Y '.to_b # => true
' yes '.to_b # => true
' YES '.to_b # => true
'0'.to_b # => false
'f'.to_b # => false
'F'.to_b # => false
'false'.to_b # => false
'FALSE'.to_b # => false
'off'.to_b # => false
'OFF'.to_b # => false
'n'.to_b # => false
'N'.to_b # => false
'no'.to_b # => false
'NO'.to_b # => false
' 0 '.to_b # => false
' f '.to_b # => false
' F '.to_b # => false
' false '.to_b # => false
' FALSE '.to_b # => false
' off '.to_b # => false
' OFF '.to_b # => false
' n '.to_b # => false
' N '.to_b # => false
' no '.to_b # => false
' NO '.to_b # => false
''.to_b # => false
' '.to_b # => false
```
#### Invalid Value Behaviour for strings
You can configure the result for invalid boolean string representations, using the `WannabeBool.invalid_value_behaviour` option.
There are 3 predefined behaviours available: to return `false` (default), `nil` or raise an `ArgumentError`:
```ruby
WannabeBool.invalid_value_behaviour = WannabeBool::InvalidValueBehaviour::False
'wherever'.to_b # => false
WannabeBool.invalid_value_behaviour = WannabeBool::InvalidValueBehaviour::Nil
'wherever'.to_b # => nil
WannabeBool.invalid_value_behaviour = WannabeBool::InvalidValueBehaviour::Error
'wherever'.to_b # => ArgumentError: is not a valid boolean representation
```
Moreover, you can provide your own behaviour for invalid boolean string representations. Just set a proc or lambda, or even any class or object that responds to `call` method.
```ruby
WannabeBool.invalid_value_behaviour = -> { :prodis }
'wherever'.to_b # => :prodis
```
Note that `WannabeBool.invalid_value_behaviour` is a global configuration. Said that, all the results for `to_b` method with invalid boolean string representations will be affected.
### 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
:'0'.to_b # => false
:f.to_b # => false
:false.to_b # => false
:off.to_b # => false
:n.to_b # => false
:no.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
```
### TrueClass
Returns `true`.
```ruby
true.to_b # => true
```
### FalseClass
Returns `false`.
```ruby
false.to_b # => false
```
### NilClass
Returns `false`.
```ruby
nil.to_b # => false
```
## Creating predicate methods
```ruby
class Fake
include WannabeBool::Attributes
attr_accessor :name, :main, :published
attr_wannabe_bool :main, :published
end
fake = Fake.new
fake.main? # => false
fake.published? # => false
fake.main = true
fake.main? # => true
fake.published = 1
fake.published? # => true
fake.main = 'true'
fake.main? # => true
fake.published = :true
fake.published? # => true
```
## Changelog
[See the changes in each version.](CHANGELOG.md)
## Author
[Fernando Hamasaki de Amorim (prodis)](http://prodis.blog.br)
## Contributing to wannabe_bool
[See the contributing guide.](CONTRIBUTING.md)