how to check if ES6 static method eists

Asked Sep 04 '19 at 09:05

Active Sep 04 '19 at 09:13

Viewed 167 times

I have an ES6 class with a static method. From another class, I wish to call that static method, but in some instances, the method may not exist.

how do I check if a static method exists before calling it?

class MyClassOne
{
    static myStaticMethod()
    {
        .... do something
    }
}

Thanks

class MyClassTwo
{
    myFunc()
    {
        if(MyClassOne.myStaticMethod)  <-- what should this be?
            MyClassOne.myStaticMethod;
    }
}

asked Sep 04 '19 at 09:05

Typhoon101

2

Your current code's `MyClassOne.myStaticMethod` should do it, you just need to actually call the function with `()` – CertainPerformance Sep 04 '19 at 09:06
That gives an error if the static method doesn't exist. `Uncaught TypeError: MyClassOne.myStaticMethod is not a function` – Typhoon101 Sep 04 '19 at 09:08
Works fine here https://jsfiddle.net/dvm1w503/ – CertainPerformance Sep 04 '19 at 09:10
1

@Typhoon101 He means `if (MyClassOne.myStaticMethod)` should work fine – slebetman Sep 04 '19 at 09:10
Ah. my apologies. I put the parentheses after myStaticMethod in the IF container, not in the function call. That works. Thanks for your help – Typhoon101 Sep 04 '19 at 09:14
@CertainPerformance Checking for an actual function might be better than just checking for a truthy value. – str Sep 04 '19 at 09:14
@str Sure, if the class has a possibility of having the property, but the property is not necessarily a function, though class properties usually are – CertainPerformance Sep 04 '19 at 09:15

0 Answers0