Web Reference: Jan 20, 2020 · In the earlier days of the Internet, underscore was the preferred method to addressing space within a URL. Today, the dash ( – ) is more often applied and recommended as a best practice. When declaring a new function, an underscore tells Swift that the parameter should have no label when called — that's the case you're seeing. A fuller function declaration looks like this: "label" is an argument label, and must be present when you call the function. Underscore is in many ways simple because you do not need a special way to handle space. If you have the name in another content like a document it is a single sting of characters.
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