Optional element in sequences

[jenshweber]

Hello,
I am trying to understand the behaviour of the option element in the FancySeq example on the Readme page.
The following throws a validation error:

(s/validate FancySeq ["test" 1 2 3])

Why is this so? I think it should validate fine, since they keyword is optional.
Is this a bug, or do I fail to understand the notion of optionality?
Thanks
Jens

[w01fe]

Not a bug, the semantics is that if an optional element is not present, the
sequence must stop there. I.e. in regex it's like (o1 (o2 r_)?)? not o1?
o2? r_

We will try to clarify that in the readme, or if you want to take a crack
at it that would be even better :). Thanks!

On Fri, Mar 18, 2016, 4:56 AM Jens Weber notifications@github.com wrote:

Hello,
I am trying to understand the behaviour of the option element in the
FancySeq example on the Readme page.
The following throws a validation error:

(s/validate FancySeq ["test" 1 2 3])

Why is this so? I think it should validate fine, since they keyword is
optional.
Is this a bug, or do I fail to understand the notion of optionality?
Thanks
Jens

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