How to Avoid Premature Function Execution When Passing JavaScript Functions as Parameters?

Passing JavaScript Functions as Parameters

Passing functions as parameters allows you to pass function references instead of executing them directly. This is useful when you need to defer execution to a later time. However, calling functions as parameters within parent functions can result in premature execution.

To avoid this, omit the parentheses when calling the function as a parameter. Here's how:

addContact(entityId, refreshContactList);

In this case, refreshContactList is passed as a reference without being executed immediately. It will only execute when the addContact function calls it.

An example:

function addContact(id, refreshCallback) {
    refreshCallback(); // Execute the callback
}

function refreshContactList() {
    console.log('Contact list refreshed');
}

addContact(1, refreshContactList); // Pass the function reference without parentheses

Here, the refreshContactList function will execute when addContact calls it. You can also pass arguments to the callback function, as shown in the example.

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