feat(transducers): add keys()/vals() iterators, refactor pairs()

packages/transducers/src/index.ts

@@ -106,6 +106,7 @@ export * from "./iter/choices";
 export * from "./iter/concat";
 export * from "./iter/cycle";
 export * from "./iter/iterate";
+export * from "./iter/keys";
 export * from "./iter/pairs";
 export * from "./iter/range";
 export * from "./iter/range2d";
@@ -114,3 +115,4 @@ export * from "./iter/repeat";
 export * from "./iter/repeatedly";
 export * from "./iter/reverse";
 export * from "./iter/tuples";
+export * from "./iter/vals";

packages/transducers/src/iter/keys.ts

@@ -0,0 +1,7 @@
+export function* keys(x: any): IterableIterator<string> {
+    for (let k in x) {
+        if (x.hasOwnProperty(k)) {
+            yield k;
+        }
+    }
+}

packages/transducers/src/iter/pairs.ts

@@ -1,5 +1,9 @@
-export function* pairs(x: any): IterableIterator<[string, any]> {
-    for (let k of Object.keys(x)) {
-        yield [k, x[k]];
+import { IObjectOf } from "@thi.ng/api/api";
+
+export function* pairs<T>(x: IObjectOf<T>): IterableIterator<[string, T]> {
+    for (let k in x) {
+        if (x.hasOwnProperty(k)) {
+            yield [k, x[k]];
+        }
     }
 }

packages/transducers/src/iter/vals.ts

@@ -0,0 +1,9 @@
+import { IObjectOf } from "@thi.ng/api/api";
+
+export function* vals<T>(x: IObjectOf<T>): IterableIterator<T> {
+    for (let k in x) {
+        if (x.hasOwnProperty(k)) {
+            yield x[k];
+        }
+    }
+}