How to interpret API documentation function parameters?

Question

Is there a standard to interpret the syntax of function interfaces in API documentations and if yes, how is it defined?

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Answer 1

API docs for dynamically typed languages can be not very meaningful if not written carefully, so do not feel too bad about it, even the most seasoned developer can have a hard time trying to understand them.

About brackets and such, there is usually a code conventions section that should explain the exact usage outside literal examples; although EBNF, Regex and Railroad Diagrams are almost ubiquitous, so you should be familiar with them to understand most notations.