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### Function

PositionProperty ( string s, func pred ) -> elt-ord^rat

### Optional Arguments

Fail | any |  | Determines what to return in case of failure.

### Description

<shortdoc> Return the position of the first character of `s' which suffices the predicate function `pred'.
Return FAILURE if no such character exists in `s'.
Note: Apparently `pred' must have `-> elt-alg^boo' out-signature. </shortdoc>

### Examples

PositionProperty("some random text",i->i in "uvwxyz");

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