Added ASet

src/aset.ts

@@ -0,0 +1,58 @@
+export class ASet<T> extends Array {
+	get size() {
+		return this.length;
+	}
+
+	constructor(elements: T[] = []) {
+		super();
+		if(!!elements?.['forEach'])
+			elements.forEach(el => this.add(el));
+	}
+
+	add(el: T) {
+		if(!this.has(el)) this.push(el);
+	}
+
+	delete(el: T) {
+		const index = this.indexOf(el);
+		if(index != -1) this.slice(index, 1);
+	}
+
+	difference(set: ASet<T>) {
+		return new ASet<T>(this.reduce((acc, el) => {
+			if(!set.has(el)) acc.push(el);
+			return acc;
+		}, []));
+	}
+
+	has(el: T) {
+		return this.indexOf(el) != -1;
+	}
+
+	intersection(set: ASet<T>) {
+		return new ASet<T>(this.reduce((acc, el) => {
+			if(set.has(el)) acc.push(el);
+			return acc;
+		}, []));
+	}
+
+	isDisjointFrom(set: ASet<T>) {
+		return this.intersection(set).size == 0;
+	}
+
+	isSubsetOf(set: ASet<T>) {
+		return this.findIndex(el => !set.has(el)) == -1;
+	}
+
+	isSuperset(set: ASet<T>) {
+		return set.findIndex(el => !this.has(el)) == -1;
+	}
+
+	symmetricDifference(set: ASet<T>) {
+		return new ASet([...this.difference(set), ...set.difference(this)]);
+	}
+
+	union(set: ASet<T> | Array<T>) {
+		return new ASet([...this, ...set]);
+	}
+}