forOwn should not call the callback for keys that are deleted in a pr…

…evious callback

src/forOwn.js

@@ -24,4 +24,5 @@
  *
  * @returns {Boolean} true if the callback function returns a truthy value for any key; otherwise, false.
  */
-export default (object, callback) => !(!object || !Object.entries(object).some((data) => callback(data[1], data[0])));
+export default (object, callback) => !(!object || !Object.keys(object)
+	.some((key) => key in object ? callback(object[key], key) : false));

tests/forOwn.Test.js

@@ -54,6 +54,31 @@ describe('forOwn', () => {
 		assert.isTrue(isCanceled);
 	});
 
+	it('should NOT call the callback for keys that are deleted in a previous callback', () => {
+		let total = 0;
+		let testVar = 0;
+		const object = {
+			key1: 'something1',
+			key2: 'something2',
+			key3: 'something3'
+		};
+
+		const isCanceled = forOwn(object, (value, key) => {
+			total++;
+			if (key === 'key1' && value === 'something1') {
+				testVar++;
+			}
+			if (key === 'key2' && value === 'something2') {
+				testVar++;
+				delete object.key3;
+			}
+		});
+
+		assert.equal(total, 2);
+		assert.equal(testVar, 2);
+		assert.isFalse(isCanceled);
+	});
+
 	it('should not call the callback for inherited properties', () => {
 		let total = 0;
 		let testVar = 0;