TsPatternMatching
Typesafe pattern matching emulation for TypeScript and JavaScript.
Syntax example:
class Whisky {
constructor(public brand:string, public age:number, public origin:string, public price:number) {}
}
const dalwhinnie = new Whisky('Dalwhinnie', 15, 'Highlands', 32);
var result = match<Whisky, string>(dalwhinnie)
.caseOf(w => w.age > 24 && w.age <= 40, () => 'Epic!')
.caseOf(w => w.age > 14 && w.age <= 24, () => 'Great')
.caseOf(({brand,age}) => age > 9 && age <= 14, () => 'Neat') // Destructuring
.caseOf(w => w.age <= 9, () => 'Meh...')
._( _ => 'Legendary!') // Wildcard
.resolve();
result.should.be.equal('Great');If no wildcard value is provided and no match is provided MatchError is thrown. More examples are available in mocha.js testsuite (see below).
Testing
You need node.js. Clone repository and then:
$ cd TsPatternMatching && npm install && gulpNavigate to 'test/bin' and open index.html to see mocha tests.
