Merge pull request #15707 from bekzod/can-invoke

fix `canInvoke` for edge cases

packages/ember-utils/lib/invoke.js

@@ -19,7 +19,7 @@ import applyStr from './apply-str';
   @private
 */
 export function canInvoke(obj, methodName) {
-  return !!(obj && typeof obj[methodName] === 'function');
+  return obj !== null && obj !== undefined && typeof obj[methodName] === 'function';
 }
 
 /**

packages/ember-utils/tests/can_invoke_test.js

@@ -19,6 +19,12 @@ QUnit.test('should return false if the object doesn\'t exist', function() {
   equal(canInvoke(undefined, 'aMethodThatDoesNotExist'), false);
 });
 
+QUnit.test('should return true for falsy values that have methods', function() {
+  equal(canInvoke(false, 'valueOf'), true);
+  equal(canInvoke('', 'charAt'), true);
+  equal(canInvoke(0, 'toFixed'), true);
+});
+
 QUnit.test('should return true if the method exists on the object', function() {
   equal(canInvoke(obj, 'aMethodThatExists'), true);
 });