Add range example

website/src/playground/files/root/examples/range.ts

@@ -0,0 +1,38 @@
+export default function main() {
+  return [...new Range(0, 10)];
+}
+
+class Range {
+  start: number;
+  end: number;
+
+  constructor(start: number, end: number) {
+    this.start = start;
+    this.end = end;
+  }
+
+  [Symbol.iterator]() {
+    return new RangeIterator(this.start, this.end);
+  }
+}
+
+class RangeIterator {
+  value: number;
+  end: number;
+
+  constructor(value: number, end: number) {
+    this.value = value;
+    this.end = end;
+  }
+
+  next() {
+    const done = this.value >= this.end;
+    const res = { value: this.value, done };
+
+    if (!done) {
+      this.value++;
+    }
+
+    return res;
+  }
+}