TypeScript: Modern JavaScript Development

Adding CRUD operations

Most servers handle CRUD operations primarily. Our server must handle five different requests: list all notes of the current user, find a specific note, insert a new note, update a note, and remove a note.

First, we add a helper function that can be used on the server side and the client side. In lib/shared/note.ts, we add a function that returns the title of a note—the first line, if available, or "Untitled":

export function getTitle(content: string) { 
  const lineEnd = content.indexOf("\n"); 
  if (content === "" || lineEnd === 0) { 
    return "Untitled"; 
  } 
  if (lineEnd === -1) { 
    // Note contains one line 
    return content; 
  } 
  // Get first line 
  return content.substring(0, lineEnd); 
} 

We write the CRUD functions in lib/server/note.ts