https://github.com/ajermakovics/optional

Optional (Maybe) type in Wren programming language https://wren.io
https://github.com/ajermakovics/optional

maybe optional wren

Last synced: about 1 month ago
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Optional (Maybe) type in Wren programming language https://wren.io

• Host: GitHub
• URL: https://github.com/ajermakovics/optional
• Owner: ajermakovics
• License: mit
• Created: 2020-06-28T13:41:14.000Z (over 5 years ago)
• Default Branch: master
• Last Pushed: 2020-06-28T16:57:27.000Z (over 5 years ago)
• Last Synced: 2025-01-30T07:11:15.287Z (about 1 year ago)
• Topics: maybe, optional, wren
• Homepage:
• Size: 2.93 KB
• Stars: 6
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# Optional

Optional type in Wren programming language https://wren.io

An optional can contain a single value or be empty.

## Examples

```

var maybe = Optional.of("abc") // Optional("abc")

maybe.isPresent() // true

maybe.each { |value| System.print(value) } // prints "abc"

var maybe2 = maybe.map { |str| str + "123" } // Optional("abc123")

var none = Optional.empty() // Optional()

System.print(none.getOr("defaultValue")) // "defaultValue"

// pick one of three optionals - first which is not empty

var maybe3 = maybeThis | orThis | maybe2 // Optional("abc123")

var res = Optional.of(request.param).filter { |v| v.count > 0 }.map { |v| v.trim() } // request param without spaces

var combined = Optional.of(1) + Optional.of(2) // Optional(3)

var reqParam = combined.flatMap {|value| Optional.of(value + 100) }  // Optional(103)

System.print(reqParam.contains(103)) // true

```

## Usage

```

import "./optional/optional" for Optional

```