The gist that shows an example of the null safety mechanism in the TypeScript programming language.

gist_ts_null_safety_mechanism.ts

const car1 = {
  brand: ‘carBrand1’
  color: ‘red’
};

const car2 = undefined;

// it logs a value
console.log(car1.color);

/* 
if we do not use null safety mechanism next part of the code will throw Uncaught 
ReferenceError: car2 is not defined
*/
console.log(car2.color);

/*
if we use null safety mechanism ?. we will avoid throwing an error and program
will continue to work - it logs undefined
*/
console.log(car2?.color)

/*
like in all other programming languages which does not have null safety mechanism,
we can also write last part of the code in the different, more complicated, way
and add possibility to forget some of the cases which then can cause ReferenceError
*/
console.log(car2 !== undefined ?? car2 !== null ? car2.color : undefined)