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How to read "Declaration" of apple developer documentation

There are many methods which has been taught and being used in sample projects.

But when I try to read the apple developer document, I can’t understand what is the syntax meaning in the “Declaration”

For example, when using TextField, I know I have to use it like

TextField("aaa", text: $bbb)

But I can’t understand the “Declaration” of TextField

struct TextField<Label> where Label : View