[Haskell-cafe] What does "1 = 2" mean in Haskell?
allbery.b at gmail.com
Fri Feb 24 02:07:42 UTC 2017
On Thu, Feb 23, 2017 at 9:05 PM, Harendra Kumar <harendra.kumar at gmail.com>
> Kids have this amazing ability to break any toy in minutes. I gave my
> seven year old daughter ghci to play with and in a little while she said it
> is broken:
> >> let 1 = 2
> >> 1
> Earlier, I had explained to her about symbols and assigning values to
> symbols, and I said numbers are not symbols. But when she came up with this
> I could not explain what's going on. How can "1 = 2" be a valid equation?
> Am I missing something fundamental here, or it is just broken?
It's a pattern match. The match fails, but as it produced no bindings it
cannot be observed and its success or failure is irrelevant.
brandon s allbery kf8nh sine nomine associates
allbery.b at gmail.com ballbery at sinenomine.net
unix, openafs, kerberos, infrastructure, xmonad http://sinenomine.net
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the Haskell-Cafe