Nullish Coalescing

There are situations where you want to apply a default value in case a variable is null or undefined (but only then). To address this, the nullish coalescing operator ?? was introduced in 2020. It returns the right-hand side operand only when the left-hand side operand is null or undefined. Otherwise, the left-hand side operand is returned.

let amount = null;
amount = amount ?? 1;
// => 1

amount = 0;
amount = amount ?? 1;
// => 0

---

References:

• https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Nullish_coalescing_operator

---

Backlinks

• null