Why can I check or x slots in some operators?

[mobility212]

@bh

In Snap!, leaving an input slot empty on purpose does mean something, namely, you are using the block in the context of a higher order function

I prefer explicit input names.

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@owlsss

This usually only happens in something like ( ) - (num), to convert (num) to a negative

Use ((0) - (num)), ((num) * (-1) @<:>) or ([neg V] of (num)) instead.

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A real use would be for secondary functionality in primitives, like that say [] hides speech bubbles or ask [] and wait closes all current ask prompts.