Firebase Realtime Database for web app giving SyntaxError

Question

 (function(){
     const preObj=document.getElementById('object');




     const preObjRef = firebase.database().ref().child('object');

     preObjRef.on('value', snap => console.log(snap.val())); 

 }());

I followed exactly some learning videos, but still receive this error...

the error in this line of code:
preObjRef.on('value', snap => console.log(snap.val()));

error text:

Uncaught SyntaxError: missing ) after argument list

Answer 1

My guess is that you're running this code in an environment that doesn't understand the ES6 fat-arrow syntax. In that case you can replace it with:

preObjRef.on('value', function(snap) { console.log(snap.val()); }); 

I'd also consider upgrading the environment where you run the code, because more and more systems assume ES6 support.