feat(transducers): add mapVals() xform

packages/transducers/README.md

@@ -619,6 +619,9 @@ reducer and optional initial accumulator/result.
 
 #### `mapNth<A, B>(n: number, offset: number, fn: (x: A) => B): Transducer<A, B>`
 
+#### `mapVals<A, B>(fn: (v: A) => B, copy = true): Transducer<IObjectOf<A>, IObjectOf<B>>`
+
+
 #### `movingAverage(n: number): Transducer<number, number>`
 
 #### `movingMedian<A, B>(n: number, key?: ((x: A) => B), cmp?: Comparator<B>): Transducer<A, A>`

packages/transducers/src/index.ts

@@ -50,12 +50,13 @@ export * from "./xform/interleave";
 export * from "./xform/interpose";
 export * from "./xform/keep";
 export * from "./xform/labeled";
+export * from "./xform/map-deep";
 export * from "./xform/map-indexed";
 export * from "./xform/map-keys";
 export * from "./xform/map-nth";
+export * from "./xform/map-vals";
 export * from "./xform/map";
 export * from "./xform/mapcat";
-export * from "./xform/map-deep";
 export * from "./xform/moving-average";
 export * from "./xform/moving-median";
 export * from "./xform/multiplex";

packages/transducers/src/xform/map-vals.ts

@@ -0,0 +1,13 @@
+import { IObjectOf } from "@thi.ng/api/api";
+import { Transducer } from "../api";
+import { map } from "./map";
+
+export function mapVals<A, B>(fn: (v: A) => B, copy = true): Transducer<IObjectOf<A>, IObjectOf<B>> {
+    return map((x) => {
+        const res: any = copy ? { ...x } : x;
+        for (let k in x) {
+            res[k] = fn(x[k]);
+        }
+        return <any>res;
+    });
+}