Short and sweet

[Jeremy Dunn]

I love it when I find something rediculously simple that I smack myself on the head wondering why it took me so long. Here it is

(define (len=? lst n)(= (length lst)(if n n 1)))

I would say over 90% of the time all I ever do with the length function is to test if a list is equal to a certain amount. You will note that if you don't supply a number the list is tested to see if it has 1 element.

Anyone else have short but sweet function that they have discovered?

[cormullion]

I like these. Pearls or gems, perhaps, or 'haikus'. I find them hard to write, though.

I wondered whether this would work:

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(define (len=? lst n)(= (length lst)(and 1 n)))

[Sammo]

The correct incantation is

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(define (len=? lst n)(= (length lst) (or n 1)))