1.0.2 • Published 10 months ago
@esfx/equatable v1.0.2
@esfx/equatable
The @esfx/equatable
package provides a low level API for defining equality.
Overview
Installation
npm i @esfx/equatable
Usage
import { Equatable, Equaler, Comparable, Comparer } from "@esfx/equatable";
class Person {
constructor(firstName, lastName) {
this.firstName = firstName;
this.lastName = lastName;
}
toString() {
return `${this.firstName} ${this.lastName}`;
}
[Equatable.equals](other) {
return other instanceof Person
&& this.lastName === other.lastName
&& this.firstName === other.firstName;
}
[Equatable.hash]() {
return Equaler.defaultEqualer.hash(this.lastName)
^ Equaler.defaultEqualer.hash(this.firstName);
}
[Comparable.compareTo](other) {
if (!(other instanceof Person)) throw new TypeError();
return Comparer.defaultComparer.compare(this.lastName, other.lastName)
|| Comparer.defaultComparer.compare(this.firstName, other.firstName);
}
}
const people = [
new Person("Alice", "Johnson")
new Person("Bob", "Clark"),
];
people.sort(Comparer.defaultComparer.compare);
console.log(people); // Bob Clark,Alice Johnson
const obj1 = new Person("Bob", "Clark");
const obj2 = new Person("Bob", "Clark");
obj1 === obj2; // false
Equaler.defaultEqualer.equals(obj1, obj2); // true
API
You can read more about the API here.
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