let testA = null; //null

//console.log(Object.is(testA, null)); //true //null === null

// This is similar to pythons' isinstanceof(class,variable_to_test)

if(Object.is(testA, null)) {

  console.log("This is a Null Value");

}

​

### Moreover you can also test using the strict equality test (===)

console> testA === null #output:  true

​

let x = null;

if (x === null) {

  console.log("x is null");

}

# output: x is null

​

​

const isNil = (value) => value === null || value === undefined;

console.log(isNil(null)); // true

console.log(isNil(undefined)); // true

console.log(isNil(123)); //false