diff --git a/README.md b/README.md
index d705249..5233988 100644
--- a/README.md
+++ b/README.md
@@ -17,8 +17,13 @@ require('to-item');
 "Some String".to([10, 15, 20]);  //15
 
 //run AB test by cookie value
-let service = cookieValue.to([new ServiceA(), new ServiceB()]);
-service.run();
+let funcA = function(){
+    console.log("function A");
+}
+let funcB = function(){
+    console.log("function B");
+}
+cookieValue.to([funcA, funcB])();
 
 //get random ip from pool
 let host = Math.random().to(['10.0.0.120', '10.0.0.121', '10.0.0.122']);
diff --git a/index.js b/index.js
index 3f41adf..b18e24d 100644
--- a/index.js
+++ b/index.js
@@ -1,23 +1,21 @@
-Object.defineProperty(Object.prototype, 'toInt', {
-    value: function (){
-        let key = this.toString();
-        if(parseInt(key).toString() === key) return Math.abs(parseInt(key));
-        let h = 0, i = key.length;
-        while (i > 0) {
-            h = (h << 5) - h + key.charCodeAt(--i) | 0;
-        }
-        return Math.abs(h);
-    },
-    enumerable: false
-});
-
 Object.defineProperty(Object.prototype, 'to', {
     value: function (map){
+
+        function toInt(key){
+            if(parseInt(key).toString() === key) return Math.abs(parseInt(key));
+            let h = 0, i = key.length;
+            while (i > 0) {
+                h = (h << 5) - h + key.charCodeAt(--i) | 0;
+            }
+            return Math.abs(h)
+        }
+
         if(typeof map === "undefined") return this.toString();
-        let int = this.toString().toInt();
+        let int = toInt(this.toString());
         let nodes = Array.from(map).sort((a, b) => a - b);
 
         return nodes[int % nodes.length];
     },
     enumerable: false
 });
+
diff --git a/package.json b/package.json
index 4fa2df5..4a1c11c 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "to-item",
-  "version": "1.0.4",
+  "version": "1.0.5",
   "description": "converts object to one item of given set",
   "main": "index.js",
   "scripts": {
diff --git a/test/spec/test.spec.js b/test/spec/test.spec.js
index c746135..e161820 100644
--- a/test/spec/test.spec.js
+++ b/test/spec/test.spec.js
@@ -8,50 +8,6 @@ class SomeObject {
 let obj = new SomeObject();
 require('../../index');
 
-describe('/convert string to int', () => {
-
-    it('should convert empty string', (done) => {
-        expect("".toInt()).toEqual(jasmine.any(Number));
-        done();
-    });
-
-    it('should convert number string', (done) => {
-        expect("123".toInt()).toEqual(jasmine.any(Number));
-        done();
-    });
-
-    it('should convert non utf-8 string', (done) => {
-        expect("ḞԍНǏ𝙅ƘԸⲘ".toInt()).toEqual(jasmine.any(Number));
-        done();
-    });
-
-    it('should different number for different strings', (done) => {
-        expect("foo".toInt()).not.toEqual("bar".toInt());
-        done();
-    });
-
-    it('should convert multiline string', (done) => {
-        expect(`
-              first line
-              second line
-            `.toInt()).toEqual(jasmine.any(Number));
-        done();
-    });
-
-    it('should convert object String', (done) => {
-        expect((String("test")).toInt()).toEqual(jasmine.any(Number));
-        done();
-    });
-
-});
-
-describe('/convert int to int', () => {
-    it('should return the same number', (done) => {
-        expect("123".toInt()).toEqual(123);
-        done();
-    })
-})
-
 describe('/convert to set', () => {
 
     it('should convert string to one of array', (done) => {
@@ -130,6 +86,11 @@ describe('/convert to set', () => {
         done();
     })
 
+    it('should return different values for different strings', (done) => {
+        expect("foo".to(["a", "b"])).not.toEqual("bar".to(["a", "b"]));
+        done();
+    });
+
 });
 
 describe('/convert object with "to" method', () => {
@@ -139,4 +100,17 @@ describe('/convert object with "to" method', () => {
     })
 });
 
+describe('/should use with functions', () => {
+    it('should call correct function', (done) => {
+        let func1 = function (){
+            return "func1";
+        }
+        let func2 = function (){
+            return "func2";
+        }
+        expect(["func1", "func2"]).toContain(Math.random().to([func1, func2])());
+        done();
+    })
+});
+