Web Reference: Feb 2, 2019 · By omitting the parentheses, you are passing the function itself as a parameter. If you added the parentheses, the function would be executed and you would pass the return of the function to the widget. Oct 22, 2025 · This is a closure that takes the same parameters as the function and invokes the underlying function when you call it. If your code needs a closure that invokes a named function with the same parameters as the closure accepts, don't wrap the call in a lambda. In Flutter, you can pass functions as parameters to other functions. This allows you to reuse code and create more modular applications. For example, you could create a function that validates user input and then pass that function to another function that handles the submission of the form.
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