diff --git a/ng-metadata.test.ts b/ng-metadata.test.ts
index 92ff916..db3e090 100644
--- a/ng-metadata.test.ts
+++ b/ng-metadata.test.ts
@@ -13,6 +13,7 @@ import './test/di/decorators.spec';
 import './test/di/povider.spec';
 import './test/util/decorators.spec';
 import './test/reflection/reflection.spec';
+import './test/facade/lang.spec';
 
 describe( 'ng-metadata', ()=> {
 
diff --git a/src/facade/lang.ts b/src/facade/lang.ts
index 13e8ac3..631bd6e 100644
--- a/src/facade/lang.ts
+++ b/src/facade/lang.ts
@@ -149,10 +149,17 @@ function _getFuncName( func: Function ): string {
   const parsedFnStatement = /function\s*([^\s(]+)/.exec(stringify(func));
   const [,name=''] = parsedFnStatement || [];
 
+  // if Function.name doesn't exist exec will find match otherwise return name property
   return name || stringify(func);
 
 }
 
+/**
+ * controller instance of directive is exposed on jqLiteElement.data()
+ * under the name: `$` + Ctor + `Controller`
+ * @param name
+ * @returns {string}
+ */
 export function controllerKey( name: string ): string {
   return '$' + name + 'Controller';
 }
@@ -160,9 +167,60 @@ export function hasCtorInjectables( Type ): boolean {
   return (Array.isArray( Type.$inject ) && Type.$inject.length !== 0);
 }
 export function firstToLowerCase( value: string ): string {
-  return value.charAt( 0 ).toLocaleLowerCase() + value.substring( 1 );
+  return _firstTo(value,String.prototype.toLowerCase);
 }
 export function firstToUpperCase( value: string ): string {
-  return value.charAt( 0 ).toUpperCase() + value.substring( 1 );
+  return _firstTo(value,String.prototype.toUpperCase);
+}
+function _firstTo( value: string, cb: Function ): string {
+  return cb.call( value.charAt( 0 ) ) + value.substring( 1 );
 }
 
+
+export function find(arr, predicate, ctx?) {
+  if ( isFunction( Array.prototype[ 'find' ] ) ) {
+    return arr.find( predicate, ctx );
+  }
+
+  ctx = ctx || this;
+  var length = arr.length;
+  var i;
+
+  if (!isFunction(predicate)) {
+    throw new TypeError(`${predicate} is not a function`);
+  }
+
+  for (i = 0; i < length; i++) {
+    if (predicate.call(ctx, arr[i], i, arr)) {
+      return arr[i];
+    }
+  }
+
+  return undefined;
+
+}
+
+export function findIndex(arr, predicate, ctx?) {
+  if (isFunction(Array.prototype['findIndex'])) {
+    return arr.findIndex(predicate, ctx);
+  }
+
+  if (!isFunction(predicate)) {
+    throw new TypeError('predicate must be a function');
+  }
+
+  var list = Object(arr);
+  var len = list.length;
+
+  if (len === 0) {
+    return -1;
+  }
+
+  for (var i = 0; i < len; i++) {
+    if (predicate.call(ctx, list[i], i, list)) {
+      return i;
+    }
+  }
+
+  return -1;
+}
diff --git a/test/facade/lang.spec.ts b/test/facade/lang.spec.ts
new file mode 100644
index 0000000..656f135
--- /dev/null
+++ b/test/facade/lang.spec.ts
@@ -0,0 +1,167 @@
+import {expect} from 'chai';
+import {
+  resolveDirectiveNameFromSelector,
+  assign,
+  stringify,
+  hasCtorInjectables,
+  firstToLowerCase,
+  firstToUpperCase,
+  find,
+  findIndex
+} from '../../src/facade/lang';
+
+describe.only( `facade`, ()=> {
+
+  describe( 'makeSelector', ()=> {
+
+    it( 'should accept element selector and create camelCase from it', ()=> {
+
+      const selector = 'hello-world';
+      expect( resolveDirectiveNameFromSelector( selector ) ).to.equal( 'helloWorld' );
+
+    } );
+    it( 'should accept attribute selector and create camelCase from it', ()=> {
+
+      const selector = '[im-your-father]';
+      expect( resolveDirectiveNameFromSelector( selector ) ).to.equal( 'imYourFather' );
+
+    } );
+    it( 'should throw error when not valid element or attribute selector provided', ()=> {
+
+      let selector = 'yabba daba';
+
+      expect( ()=>resolveDirectiveNameFromSelector( selector ) ).to
+        .throw( 'Only selectors matching element names or base attributes are supported, got: yabba daba' );
+
+    } );
+
+  } );
+  describe( `assign`, ()=> {
+
+    it( `should extend object exactly as Object.assign`, ()=> {
+
+      const one = {foo:'yay'};
+      const two = {foo:'nay',boo:'low'};
+
+      const actual = assign(one,two);
+      const expected = {foo:'nay',boo:'low'};
+
+      expect( actual ).to.deep.equal( expected );
+      expect( assign( {}, { one: 1 }, { two: 2 } ) ).to.deep.equal( { one: 1, two: 2 } );
+
+    } );
+
+  } );
+
+  describe( 'stringify', ()=> {
+
+    it( 'should return name property if it exist on provided type', ()=> {
+
+      function foo() {}
+
+      function boo() {
+        return 'hello';
+      }
+
+      class Moo {}
+
+      expect( stringify( foo ) ).to.equal( 'foo' );
+      expect( stringify( boo ) ).to.equal( 'boo' );
+      expect( stringify( Moo ) ).to.equal( 'Moo' );
+
+    } );
+
+    it( 'should return first line string of function definition if the function is anonymous',  ()=> {
+
+      let anonFn = function () {};
+      let anonFnMultiLine = function () {
+        console.log( 'yoo' );
+        return null;
+      };
+
+      expect( stringify(anonFn) ).to.equal( 'function () { }' );
+      expect( stringify(anonFnMultiLine) ).to.equal( 'function () {' );
+
+    } );
+
+    it( `should return string of provided type if it isn't a function`,  ()=> {
+
+      const obj = { hello: 'world' };
+
+      expect( stringify( 'hello' ) ).to.equal( 'hello' );
+      expect( stringify( null ) ).to.equal( 'null' );
+      expect( stringify( undefined ) ).to.equal( 'undefined' );
+      expect( stringify( [ 1, 2 ] ) ).to.equal( `1,2` );
+      expect( stringify( obj ) ).to.equal( '[object Object]' );
+
+    } );
+
+  } );
+
+  describe( 'hasInjectables', ()=> {
+
+    it( 'should check if Type has $inject as array and its not empty', ()=> {
+
+      class Moo {
+        static $inject = [ 'hello' ];
+      }
+      class NoMames {
+        static $inject = [];
+      }
+      const obj = { $inject: null };
+      const name = 'jabba';
+
+      expect( hasCtorInjectables( Moo ) ).to.equal( true );
+      expect( hasCtorInjectables( NoMames ) ).to.equal( false );
+      expect( hasCtorInjectables( obj ) ).to.equal( false );
+      expect( hasCtorInjectables( name ) ).to.equal( false );
+
+    } );
+
+
+  } );
+
+  describe( 'firstLowerCase', function () {
+
+    it( 'should return string with first char lowercase', ()=> {
+
+      expect( firstToLowerCase( 'JediMaster' ) ).to.equal( 'jediMaster' );
+
+    } );
+
+  } );
+  describe( 'firstUpperCase', function () {
+
+    it( 'should return string with first char uppercase',  ()=> {
+
+      expect( firstToUpperCase( 'jediMaster' ) ).to.equal( 'JediMaster' );
+
+    } );
+
+  } );
+
+  describe( `ES6 Array ponyfills`, ()=> {
+
+    it( `should find array item or undefined if not found`, ()=> {
+
+      let arr:any[] = [ 1, 2, 3, 4, 5 ];
+      let found = find( arr, ( el )=> el === 2 );
+      expect( found ).equal( 2 );
+
+      arr = [{name: 'adam'}, {name: 'eve'}, {name: 'john'}];
+      found = find(arr, (el)=>el.name === 'eve');
+      expect(found).to.deep.equal({name: 'eve'});
+
+    } );
+    it( `should find array item position or -1 if not found`, ()=> {
+
+      const arr = [10, 20, 30, 40];
+
+      expect( findIndex( arr, ( x )=>x === 30 ) ).to.equal( 2 );
+      expect( findIndex( arr, ( x )=>x === 'noop' ) ).to.equal( -1 );
+
+    } );
+
+  } );
+
+} );