Nullish coalescing operator

 Nullish coalescing operator

The nullish coalescing operator (??) is a new operator in JavaScript that provides a more reliable way to check for null or undefined values. It returns the first operand if it's not null or undefined, otherwise it returns the second operand. Here's an example:

const foo = null ?? 'default value';

console.log(foo); // Output: 'default value'

const bar = 0 ?? 'default value';

console.log(bar); // Output: 0 (because 0 is not null or undefined)

In the code above, the nullish coalescing operator (??) is used to provide default values for variables (foo and bar) that may be null or undefined.