Replace arrow function

diff --git a/src/lib/duration/constructor.js b/src/lib/duration/constructor.js
index 994adab4fc10b6b32564a94f7551f48e8566c24b..9dd98e3e80366268e02b8e9320f3db0efda49d5d 100644 (file)
--- a/src/lib/duration/constructor.js
+++ b/src/lib/duration/constructor.js
@@ -6,7 +6,9 @@ export function Duration (duration) {
     var normalizedInput = normalizeObjectUnits(duration);
 
     this._isValid = isDurationValid(normalizedInput);
-    this.isValid = () => this._isValid;
+    this.isValid = function () {
+        return this._isValid;
+    };
 
     var years = this._isValid && normalizedInput.year || 0,
         quarters = this._isValid && normalizedInput.quarter || 0,