fnguard

fnguard
=======
(c)[Bumblehead][0] MIT-license

fnguard provides something similar to an Erlang-style "function guard". Inside the function, the parameter types are specified and, at runtime, if one of the params is wrong, and error is thrown and with a message explaining which parameter failed and a stack trace started from the call to fnguard.

The function used for 'isobj' returns false for array, date, null, regexp and other not-object things that return 'object' from typeof experessions.

Here's an example of its usage
``javascript
gethtml = (session, config, templatename, dataarr) => {
fnguard.isobj(session, config).isstr(templatename).isarr(dataarr)

// continue
}
`

fnguard is useful when refactoring bigger javascript codebases for which you have no unit-tests. Or highly dynamic sources which are difficult to type check. Run the tests or look at the [source code][1] (small) to understand how it handles comparison.

A negation function prefixed with _isnot_ is provided for each '_is_' function, for example:

`javascript
spec.isnotnum = function (n) {
return !spec.isnum(n)
}
``

Todo:
- would be great if fnguard could use custom types (similar to how [Erlang does this][3])

[0]: https://bumblehead.com "bumblehead"
[1]: https://github.com/iambumblehead/fnguard/blob/main/fnguard.js
[2]: https://github.com/iambumblehead/fnguardrm
[3]: http://www.erlang.org/doc/reference_manual/typespec.html "erlang type spec"

!scrounge

(The MIT License)

Copyright (c) [Bumblehead][0]

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