initial commit

table.ts

@@ -0,0 +1,45 @@
+export type Entry = { id: number };
+
+export class Table<TableEntry extends Entry> {
+  entries: TableEntry[] = [];
+  autoIncrementId: number = 1;
+
+  constructor(private saveCallback: () => Promise<void>) {}
+
+  private generateId(): number {
+    return this.autoIncrementId++;
+  }
+
+  async insert(record: Omit<TableEntry, "id">) {
+    const recordWithId = { ...record, id: this.generateId() } as TableEntry;
+    this.entries.push(recordWithId);
+    await this.saveCallback();
+    return recordWithId;
+  }
+
+  select(predicate: (entry: TableEntry) => boolean): TableEntry[] {
+    return this.entries.filter(predicate);
+  }
+
+  async update(
+    predicate: (entry: TableEntry) => boolean,
+    updateFn: (entry: TableEntry) => void,
+  ) {
+    const updated: TableEntry[] = [];
+    this.entries.forEach((record) => {
+      if (predicate(record)) {
+        updateFn(record);
+        updated.push(record);
+      }
+    });
+    await this.saveCallback();
+    return updated;
+  }
+
+  async delete(predicate: (entry: TableEntry) => boolean) {
+    const deletedEntries = this.entries.filter(predicate);
+    this.entries = this.entries.filter((record) => !predicate(record));
+    await this.saveCallback();
+    return deletedEntries;
+  }
+}