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https://github.com/gfldex/perl6-operator-defined-alternation

Provides a ?? !! equivalent that tests for definedness instread of trueness.
https://github.com/gfldex/perl6-operator-defined-alternation

Last synced: 13 days ago
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Provides a ?? !! equivalent that tests for definedness instread of trueness.

Host: GitHub
URL: https://github.com/gfldex/perl6-operator-defined-alternation
Owner: gfldex
License: artistic-2.0
Created: 2016-07-04T13:50:08.000Z (over 8 years ago)
Default Branch: master
Last Pushed: 2017-07-30T08:15:59.000Z (over 7 years ago)
Last Synced: 2024-11-06T05:44:08.413Z (2 months ago)
Language: Perl 6
Size: 9.77 KB
Stars: 1
Watchers: 2
Forks: 2
Open Issues: 0
Metadata Files:
- Readme: README.md
- License: LICENSE

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README

# Operator::defined-alternation
[![Build Status](https://travis-ci.org/gfldex/perl6-operator-defined-alternation.svg?branch=master)](https://travis-ci.org/gfldex/perl6-operator-defined-alternation)

Perl 6 provides control statements and operators to test for definedness instead of trueness, to provide ease of typing and a clear statement of intend from the programmer. Sadly there is currently no way to define your own ternary operators with Rakudo. However, we can emulate operators with 3 arguments with a chain of 2 infix operators, as long as we provide a type for the 2nd infix to handle dispatch properly.

## Usage:
```
use v6;
use Operator::defined-alternation;

my $falsish = 2 but False;
say $falsish ?// 'defined' !! 'undefined';
# OUTPUT: defined
# What is equivalent to:
say $falsish.defined ?? 'defined' !! 'undefined';
# OUTPUT: defined
# But opposed to:
say $falsish ?? 'true' !! 'false';
# OUTPUT: false
```

## License