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$ curl repovive.com/roadmaps/javascript/introduction-to-typescript/optional-parameters

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$ curl repovive.com/roadmaps/javascript/introduction-to-typescript/optional-parameters

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Optional Parameters - Introduction to TypeScript | JavaScript | Repovive

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JavaScript22 sections · 783 units18h total

Open in Course

Optional Parameters

Parameters that can be omitted

Mark optional parameters with ?. They can be omitted when calling.

function greet(name: string, greeting?: string) {
  return `${greeting || "Hello"}, ${name}`;
}

greet("Alice");          // "Hello, Alice"
greet("Alice", "Hi");    // "Hi, Alice"

Optional parameters must come after required ones.