How can I properly use JavaScript to pass a function as a parameter without it executing immediately?

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2

Hey! The problem is that you’re calling the function when you do refreshContactList() what you want instead is to pass the function itself:

addContact(entityId, refreshContactList);

Then inside addContact, you can choose when to run it:

function addContact(id, callback) {
  // do something with id
  if (typeof callback === "function") {
    callback(); // only run it when needed
  }
}

This makes it much more flexible, especially if you’re working in a team others can reuse addContact with different callbacks without changing its internals.