use typeof for checking function

gre · gre · commit 5e24aa603300 · 2015-12-23T12:47:04.000+01:00
diff --git a/Libraries/CustomComponents/Navigator/Navigator.js b/Libraries/CustomComponents/Navigator/Navigator.js
@@ -1089,7 +1089,7 @@ var Navigator = React.createClass({
     return React.cloneElement(this.props.navigationBar, {
       ref: (navBar) => {
         var navigationBar = this.props.navigationBar;
-        if (navigationBar && navigationBar.ref instanceof Function) {
+        if (navigationBar && typeof navigationBar.ref === "function") {
           navigationBar.ref(navBar);
         }
         this._navBar = navBar;

Original file line number	Diff line number	Diff line change
`@@ -1089,7 +1089,7 @@ var Navigator = React.createClass({`
`1089`	`1089`	`return React.cloneElement(this.props.navigationBar, {`
`1090`	`1090`	`ref: (navBar) => {`
`1091`	`1091`	`var navigationBar = this.props.navigationBar;`
`1092`		`- if (navigationBar && navigationBar.ref instanceof Function) {`
	`1092`	`+ if (navigationBar && typeof navigationBar.ref === "function") {`
`1093`	`1093`	`navigationBar.ref(navBar);`
`1094`	`1094`	`}`
`1095`	`1095`	`this._navBar = navBar;`