Github user clelland commented on the pull request:
https://github.com/apache/cordova-plugin-camera/pull/21#issuecomment-39117406
Not just shell commands; other languages with optional parameters use this
notation as well.
When describing a function, I've seldom seen square brackets meaning "An
array goes here". Certainly in example code, or snippets that say things like
"Call it like this: `foo(bar, baz, [item, item, ...])`",
but not when declaring the function signature.
My feeling is that square brackets are pretty universally used to mean
"optional", but more strongly than that, I think we'd need a good way to denote
optionality if we drop them. Just dropping the square brackets and leaving the
three arguments shown the same way is leaving out some of the most important
information for a reader who wants to know how to call the function.
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