Re: [Chicken-users] Problem with (fold)

[Daniel Carrera]

I think I've answered my own question: I have to switch the "a" and the "b".

I guess I was confused as to how parameters are sent into the lambda.

Cheers,

Daniel.

On 11 March 2014 15:30, Daniel Carrera <address@hidden> wrote:

Hello,

I'm having a problem with (fold):

(use srfi-1)  ; List library.

(fold (lambda (a b) (+ (* a 10) b)) 0 '(1 2 3))

I was expecting this to return 123, but it returns 60. I'm confused. In my mind, at each step I shift the current value to the left (i.e. multiply by 10) and add the new digit. So the steps should be:

1 , 2 --> 10 + 1 = 12

12 , 3 --> 120 + 3 = 123

What am I missing?

Cheers,

Daniel.

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When an engineer says that something can't be done, it's a code phrase that means it's not fun to do.

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When an engineer says that something can't be done, it's a code phrase that means it's not fun to do.