How do I give a pattern a value?

Every Pattern<V> carries a value of type V. The most common type is Subject, which carries identity, labels, and properties. Pass the value as the first argument to any constructor.

Rust

use pattern_core::Pattern;
use pattern_core::Subject;

// Subject with identity and a label
let subject = Subject::from_id("alice")
    .with_label("Person");

let p = Pattern::point(subject);

Python

from relateby.pattern import Pattern, Subject

subject = Subject.from_id("alice").with_label("Person")
p = Pattern.point(subject)

TypeScript

import { Pattern, Subject } from "@relateby/pattern"

const subject = Subject.fromId("alice").withLabel("Person")
const p = Pattern.point(subject)

Subject supports chaining: add multiple labels with .with_label() and properties with .with_property().

See also: What is a Subject?