Implement Collection

src/collection/flatMap.ts

@@ -0,0 +1,7 @@
+export function flatMap<T, R>(value: T[], transform: (it: T) => Iterable<R>): R[] {
+    const result: R[] = [];
+    for (const it of value) {
+        result.push(...transform(it));
+    }
+    return result;
+}