Could be a very basic question. I am wondering how I can call a function from another in LWC. 

for eg: 

```
export default class testUtil extends LightningElement {
hangleChange(evt){
  this.inputcheck = evt.detail.value;
  if(inputval == true){
     showtoast(inputval);
  }
}
 showToast(inpval) {
        const event = new ShowToastEvent({
            title: 'Get Help',
            message: 'Input val changed.'+ inpval,
        });
        this.dispatchEvent(event);
    }
}

```

I assumed I could use testUtil.showToast(inpval) even that does not work I get undefined function, in case of aura framework I can call functions in the helper method as much as I can, am I missing something or is there no way to build reusable functions in LWC?