SWI-Prolog -- string

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Predicate string_length/2

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Availability:built-in

string_length(+String, -Length)

Unify Length with the number of characters in String. This predicate is functionally equivalent to atom_length/2 and also accepts anytext as its first argument. Numeric types are formatted into strings before the length of their string representation is determined.^{174This
behavior should be considered deprecated} See also write_length/3.

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LogicalCaptain said (2020-07-24T11:04:31):

For "anytext", see this page.

Also take a look at the comments for atom_length/2.

Replacement

Here is simple code for a common stringy_length∕2 which refers to atom_length/2 and string_length/2 as needed. This already happens, but there is still this troubling naming specificity, which I would like to get rid of.