Pattern matching object structures
npm install match-withPattern matching object structures. Semi-related to tc39/proposal-pattern-matching.
``bash`
yarn add match-with
Basic syntax:
`ts
import { match } from "match-with";
match(subject: any)
.with(pattern1: any, callback1: (subject, pattern1) => result: any)
.with(pattern2: any, callback2: (subject, pattern2) => result: any)
.default(callback3: (subject) => result: any)
.result;
`
Examples:
`ts
...
const subject = {
one: 1,
two: undefined,
three: "3",
};
match(subject)
.with({ one: 1, two: undefined }, () => {
return "match";
})
.result; // "match";
match(subject)
.with({ one: 2 }, () => {
// Skipped.
})
.default(() => {
return 1;
});
match(subject)
.with({ one: n => n < 2 }, () => {
console.log(true);
});
match(subject)
.with({ four: match.EXISTS }, () => {
// Skipped.
})
.with({ four: undefined }, () => {
return 4;
});
``
Let me know what you think. After you ★ this project, follow me @Rygu on Twitter.
BSD 3-Clause license. Copyright © 2019, Rick Wong. All rights reserved.