how to check falsy with undefined or null?

Question

undefined and null are falsy in javascript but,

var n = null;
if(n===false){
console.log(\'null\');
} else{
console.log(\'has value\');
}

b

Answer 1

You can check for falsy values using

var n = null;
if (!n) {
    console.log('null');
} else {
    console.log('has value');
}

Demo: Fiddle

---

Or check for truthiness like

var n = null;
if (n) { //true if n is truthy
    console.log('has value');
} else {
    console.log('null');
}

Demo: Fiddle