1 files changed, 9 insertions, 0 deletions
diff --git a/src/util.ts b/src/util.ts
index 6ab90ce..ad2b482 100644
--- a/src/util.ts
+++ b/src/util.ts
@@ -11,3 +11,12 @@ export function mapPromises<T>(promises: {[key: string]: Promise<T>}): Promise<{
 
         return Promise.all(p).then(() => ret);
 }
+
+export function numberArrayToMap(arr: number[]): {[key: number]: boolean} {
+        var ret: {[key: number]: boolean} = {};
+
+        for (let v of arr)
+                ret[v] = true;
+
+        return ret;
+}