iteragain - npm Package Compare versions

Comparing version 0.9.2 to 0.10.0

ExtendedIterator.d.ts

@@ -1,4 +0,4 @@
-import { IteratorOrIterable, FlattenDeep, FlattenDepth1, FlattenDepth2, FlattenDepth3, FlattenDepth4, FlattenDepth5 } from './types';
+import { IteratorOrIterable, FlattenDeep, FlattenDepth1, FlattenDepth2, FlattenDepth3, FlattenDepth4, FlattenDepth5, Tuple } from './types';
 export declare class ExtendedIterator<T> implements IterableIterator<T> {
-    protected readonly iterator: Iterator<T>;
+    protected iterator: Iterator<T>;
     constructor(iterator: Iterator<T>);
@@ -67,2 +67,5 @@ /** Returns a `{ value, done }` object that adheres to the Iterator interface. */
     pairwise(): ExtendedIterator<[T, T]>;
+    /** Peek ahead of where the current iteration is. */
+    peek(): T | undefined;
+    peek<N extends number>(ahead: N): Tuple<T | undefined, N>;
     /**
@@ -69,0 +72,0 @@ * Take the first `n` elements from this iterator.

ExtendedIterator.js

@@ -103,2 +103,10 @@ "use strict";
     }
+    peek(ahead) {
+        const values = [];
+        do
+            values.push(this.iterator.next().value);
+        while (--ahead > 0);
+        this.iterator = new ConcatIterator_1.default([(0, toIterator_1.default)(values), this.iterator]);
+        return !isNaN(ahead) ? values : values[0];
+    }
     /**
@@ -105,0 +113,0 @@ * Take the first `n` elements from this iterator.

package.json

 {
   "name": "iteragain",
-  "version": "0.9.2",
+  "version": "0.10.0",
   "description": "Javascript ES6 Iterable/Iterator utilities.",
@@ -5,0 +5,0 @@ "main": "index.js",

types.d.ts

@@ -8,1 +8,4 @@ export declare type IteratorOrIterable<T> = Iterator<T> | Iterable<T>;
 export declare type FlattenDepth5<T> = T extends IteratorOrIterable<infer V> ? FlattenDepth4<V> : T;
+declare type _TupleOf<T, N extends number, R extends unknown[]> = R['length'] extends N ? R : _TupleOf<T, N, [T, ...R]>;
+export declare type Tuple<T, N extends number> = N extends N ? number extends N ? T[] : _TupleOf<T, N, []> : never;
+export {};

No alert changes

Improved metrics

Total package byte prevSize

44637

increased by1.61%

Lines of code

897

increased by1.59%

No dependency changes