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Customise Operator: ⌾

Module: Additional2
Syntax: fn1 ⌾ fn2; fn2 must be customisable
Errors: R.ContextException
Keystrokes: Ctrl+K

Provides a custom internal method for the customisable function fn2. Functions where there is internal processing (for example, the comparison done within the sorting algorithm) may allow you to provide your own method instead. The requirements for fn1 vary depending on what function fn2 is. The result will be a modified version of fn2, syntactically identical (i.e. same valence, rank etc).

The following functions in the standard set are customisable:

Extra plugins may include other customisable functions. You should look at the reference for a particular function to find out if it is customisable, and if so what form fn1 should take.

The ContextException is thrown if fn2 is not customisable, or if fn1 is not a suitable custom function.