Fix findIndex definition

ntrrgc · ntrrgc · commit 01281926002f · 2016-05-20T03:41:56.000+02:00
diff --git a/src/lib/es2015.core.d.ts b/src/lib/es2015.core.d.ts
@@ -16,12 +16,12 @@ interface Array<T> {
       * Returns the index of the first element in the array where predicate is true, and undefined
       * otherwise.
       * @param predicate find calls predicate once for each element of the array, in ascending
-      * order, until it finds one where predicate returns true. If such an element is found, find
-      * immediately returns that element value. Otherwise, find returns undefined.
+      * order, until it finds one where predicate returns true. If such an element is found, 
+      * findIndex immediately returns that element index. Otherwise, findIndex returns -1.
       * @param thisArg If provided, it will be used as the this value for each invocation of
       * predicate. If it is not provided, undefined is used instead.
       */
-    findIndex(predicate: (value: T) => boolean, thisArg?: any): number | undefined;
+    findIndex(predicate: (value: T) => boolean, thisArg?: any): number;
 
     /**
       * Returns the this object after filling the section identified by start and end with value
@@ -493,4 +493,4 @@ interface StringConstructor {
       * @param substitutions A set of substitution values.
       */
     raw(template: TemplateStringsArray, ...substitutions: any[]): string;
-}
+}
