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Callback Functions - Asynchronous JavaScript | JavaScript | Repovive

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JavaScript22 sections · 783 units18h total

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Callback Functions

Pass functions to handle results

Callbacks are functions passed to async operations. They run when the operation completes, receiving the result.

function fetchUser(id, callback) {
  // Simulated async operation
  setTimeout(() => {
    callback({ id, name: "Alice" });
  }, 100);
}

fetchUser(1, (user) => {
  console.log(user.name); // "Alice"
});