Keyword Args & Immutability
Using Python's keyword args and immutability with Transcrypt.
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Keyword arguments
By default, unpacking keyword arguments with **kwargs in a function does not work out of the box in Transcrypt. This is because it would lead to bloated code when it gets transpiled to JavaScript. Fortunately, Transcrypt provides us with a compiler directive that will selectively enable that feature for just when it’s needed. Here is a simple example:
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# __pragma__('kwargs')def test_function(**kwargs):for key, val in kwargs.items():print(key, ":", val)# __pragma__('nokwargs')
So, we basically just have to wrap our function that uses **kwargs in the __pragma__ compiler directives to turn it on, then turn it off again. Transcrypt will then make sure that the function is transpiled into JavaScript with that ...