// retoor <retoor@molodetz.nl>
import "dataset" for Dataset
var ds = Dataset.memory()
System.print(ds.tables.count) // expect: 0
ds["users"].insert({"name": "Alice"})
System.print(ds.tables.count) // expect: 1
System.print(ds.tables.contains("users")) // expect: true
ds["products"].insert({"name": "Widget"})
System.print(ds.tables.count) // expect: 2
System.print(ds.tables.contains("products")) // expect: true
ds["orders"].insert({"total": 100})
System.print(ds.tables.count) // expect: 3
ds.close()