@ts-common/iterator - npm Package Compare versions

Comparing version 0.3.3 to 0.3.4

dist/index.d.ts

@@ -133,2 +133,6 @@ /**
     readonly uniq: (key?: (v: T) => unknown) => IterableEx<T>;
+    /**
+     * Creates a new sequence of accamulated values.
+     */
+    readonly scan: <A>(func: (a: A, b: T, i: number) => A, init: A) => IterableEx<A>;
 };
@@ -155,2 +159,3 @@ export declare const iterable: <T>(createIterator: () => Iterator<T>) => IterableEx<T>;
 export declare const repeat: <T>(v: T, count?: number | undefined) => IterableEx<T>;
+export declare const scan: <T, A>(input: Iterable<T> | undefined, func: (a: A, b: T, i: number) => A, init: A) => IterableEx<A>;
 export declare const fold: <T, A>(input: Iterable<T> | undefined, func: (a: A, b: T, i: number) => A, init: A) => A;
@@ -157,0 +162,0 @@ export declare const reduce: <T>(input: Iterable<T> | undefined, func: (a: T, b: T, i: number) => T) => T | undefined;

dist/index.js

@@ -31,2 +31,3 @@ "use strict";
         zip: property(exports.zip),
+        scan: property(exports.scan),
     };
@@ -110,2 +111,12 @@ };
 exports.repeat = (v, count) => exports.generate(() => v, count);
+exports.scan = (input, func, init) => exports.iterable(function* () {
+    let result = init;
+    yield result;
+    /* tslint:disable-next-line:no-loop-statement */
+    for (const [index, value] of exports.entries(input)) {
+        /* tslint:disable-next-line:no-expression-statement */
+        result = func(result, value, index);
+        yield result;
+    }
+});
 exports.fold = (input, func, init) => {
@@ -112,0 +123,0 @@ let result = init;

package.json

 {
   "name": "@ts-common/iterator",
-  "version": "0.3.3",
+  "version": "0.3.4",
   "description": "Iterator library for JavaScript and TypeScript",
@@ -5,0 +5,0 @@ "main": "dist/index.js",

src/index.ts

@@ -136,2 +136,6 @@ /**
     readonly uniq: (key?: (v: T) => unknown) => IterableEx<T>,
+    /**
+     * Creates a new sequence of accamulated values.
+     */
+    readonly scan: <A>(func: (a: A, b: T, i: number) => A, init: A) => IterableEx<A>,
 }
@@ -168,2 +172,3 @@
         zip: property(zip),
+        scan: property(scan),
     }
@@ -301,2 +306,18 @@ }
 
+export const scan = <T, A>(
+    input: Iterable<T> | undefined,
+    func: (a: A, b: T, i: number) => A,
+    init: A,
+): IterableEx<A> =>
+    iterable(function *() {
+        let result: A = init
+        yield result
+        /* tslint:disable-next-line:no-loop-statement */
+        for (const [index, value] of entries(input)) {
+            /* tslint:disable-next-line:no-expression-statement */
+            result = func(result, value, index)
+            yield result
+        }
+    })
+
 export const fold = <T, A>(
@@ -303,0 +324,0 @@ input: Iterable<T> | undefined,

No alert changes

Improved metrics

Total package byte prevSize

63055

3.19%

Lines of code

824

4.57%

No dependency changes