Notices

1. spectrumgomas@functional.cafe's status on Thursday, 17-Jun-2021 21:27:40 CEST spectrumgomas

   I have a problem with Mark Mahoney "An Animated Introduction to Clojure" Chapter 3 Interest in an account, but in GNU #guile. What should I write here? https://pastebin.com/W40WLtxa

   • Abbie Normal (abbienormal@social.device5.co.uk)'s status on Thursday, 17-Jun-2021 22:00:56 CEST Abbie Normal

     in reply to

     @spectrumgomas

     I see in the clojure version they use a for cycle

     That's strange

     What does the clojure procedure return ?

     A list ? Or maybe a number ?

     Or anything else ?

     If, as I think, you want a list, you could write it like this:

     (map (lambda (interest-function) (interest-function principal year-number)) interest-functions)

   • spectrumgomas@functional.cafe's status on Thursday, 17-Jun-2021 22:00:56 CEST spectrumgomas

     in reply to

     • Abbie Normal

     @AbbieNormal (interest-functions (map value-after-years-generator rates)) creates a list of partial functions in interest-functions. Now I want apply all these functions and create a list with the results.

   • Abbie Normal (abbienormal@social.device5.co.uk)'s status on Thursday, 17-Jun-2021 22:21:19 CEST Abbie Normal

     in reply to

     @spectrumgomas

     doesn't this work ?

     (map (lambda (interest-function) (interest-function principal year-number)) interest-functions)

   • spectrumgomas@functional.cafe's status on Thursday, 17-Jun-2021 22:21:19 CEST spectrumgomas

     in reply to

     • Abbie Normal

     @AbbieNormal I don't think so. interest-functions isn't the list of arguments. It's a list of partial functions.

     Ekaitz Zárraga 👹 repeated this.
   • spectrumgomas@functional.cafe's status on Thursday, 17-Jun-2021 22:47:26 CEST spectrumgomas

     in reply to

     • Abbie Normal

     @AbbieNormal Ah, I've never seen map over a list of functions before. Then that's probably the solution. Thanks!

   • Abbie Normal (abbienormal@social.device5.co.uk)'s status on Thursday, 17-Jun-2021 22:47:27 CEST Abbie Normal

     in reply to

     @spectrumgomas

     I know and I apply them, in that code 🙂

     spectrumgomas and Ekaitz Zárraga 👹 repeated this.
   • Abbie Normal (abbienormal@social.device5.co.uk)'s status on Thursday, 17-Jun-2021 22:47:27 CEST Abbie Normal

     in reply to

     @spectrumgomas

     you can map over a list of functions

     map applies that "lambda" on every function in interest-functions

     and the lambda calls every one of those partial functions with "principal" and "year-number"