TypeScript

TypeScript - Undefined

Sample

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getAllPolicyAttachmentsByPolicyId(policyId: number | undefined): Observable<Result<PolicyAttachment[]>> {
  console.log(`getAllPolicyAttachmentsByPolicyId - ${policyId}`);
  if (policyId === undefined) {
    return this.http.get<Result<PolicyAttachment[]>>(this.apiUrl);
  } else {
    return this.http.get<Result<PolicyAttachment[]>>(`${this.apiUrl}/getallbypolicyid/${policyId}`);
  }
  
}

In this example policyId will either be a number, or it will be undefined.

An if statement checks, and calls different API depending on the logic.

References