typescript "variable?: type" notation
// the "last" property is optional and can be undefined
function printName(obj: { first: string; last?: string }) { // ...}// Both OKprintName({ first: "Bob" });printName({ first: "Alice", last: "Alisson" });Trytypescript "variable!: type" notation
// Writing ! after any expression is effectively a type assertion
// that the value isn’t null or undefined
function liveDangerously(x?: number | null) { // No error console.log(x!.toFixed());}TryCopyright © 2021 Codeinu
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