Coalescing operator ??

The nullish coalescing (??) operator is a logical operator that returns its right-hand side operand when its left-hand side operand is null or undefined, and otherwise returns its left-hand side operand.

const foo = null ?? 'default string'
console.log(foo)
// Expected output: "default string"

const baz = 0 ?? 42
console.log(baz)
// Expected output: 0