Some arguments for UI components are optional, so we don't have to provide all of them when using them. I had added a `defined?(name)` check to use default values when an argument is not provided. Jeremy pointed out that it was working by accident. In the code `name = defined?(name)`, `defined?(name)` always returns `local-variable` because it’s on the right-hand side of the assignment, while the local variable is on the left-hand side. When we remove the `defined?` calls, the remaining code is equivalent to `||=`.
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