typescript “variable?: type” notation typescript “variable!: type” notation

The solution for “typescript “variable?: type” notation typescript “variable!: type” notation” can be found here. The following code will assist you in solving the problem.

// 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” });Try// 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());}Try

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