fix-enumerate-typing

uriva · Dec 22, 2023 · d439740 · d439740
1 parent 51d8a3a
commit d439740
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/src/array.ts b/src/array.ts
@@ -101,7 +101,8 @@ export const includedIn = <T>(array: T[]) => (x: T) => array.includes(x);
 export const take = <T>(n: number) => (xs: T[]) => xs.slice(0, n);
 export const drop = <T>(n: number) => (xs: T[]) => xs.slice(n);
 
-export const enumerate = <T>(xs: T[]) => xs.map((x, i) => [i, x]);
+export const enumerate = <T>(xs: T[]): [number, T][] =>
+  xs.map((x, i) => [i, x]);
 
 export const slidingWindow = <T>(l: number) => (xs: T[]) =>
   xs.flatMap((_, i) => (i <= xs.length - l ? [xs.slice(i, i + l)] : []));