How Does Go\'s Defer Keyword Work in Function Execution Order?
Understanding the Functionality of Go's Defer Keyword
When working with Go, understanding the behavior of the defer keyword is crucial. This keyword allows developers to defer the execution of a function until the surrounding function returns. However, it's important to note that the function's value and parameters are evaluated when the defer statement executes.
Example: Evaluating Defer Order
To illustrate this, consider the following code:
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In this example, the code is executed in the following order:
- having function is evaluated and returns a function that takes a string as input (evaluation order: 1)
- fun function is evaluated with the "with Go." string as input (evaluation order: 2)
- fmt.Print("some ") is executed (evaluation order: 3)
- defer calls funWithGo function with the result from fun (evaluation order: 4)
Applying the Defer Principle
To resolve the issue mentioned in the original query, we can use the defer keyword to correctly print the ticket price based on the entered age. Below is a modified version of the code:
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In this modified code, we correctly leverage the defer keyword to ensure that the age and ticket price are printed after the respective functions have executed, resolving the initial issue.
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