JSFiddle - React, Tailwind, and code Playground

JavaScript

function fn1(){
    return false;
}

function fn2(){
    return;
}

if (fn2() == false){
    alert("not == fn1");
}


if (fn2() === false){
    alert("not === fn1");
}

if (!fn1()){
    alert("not fn1");
}

if (!fn2()){
    alert("not fn2");
}