Create a global counter in a NodeJS module

Question

I am trying to create unique ids for my React components. I have created this modules:

var _uid = 0;

function getUid(): {
    ++_uid;
    return `_uid_${_uid}`;
}

export default getUid;

Hoping that the _uid would be increased every time the module function is called, but it is always 1. How can I achieve increase it every time the module is required?

Answer 1

Java script closure helps you there:

    var getUid = (function(){
       var _uid: number = 0;
       return function(){ 
        ++_uid;
        return `_uid_${_uid}`;
       }
    })();

export default getUid;