8000 Add missing function /= · Issue #53 · skx/yal · GitHub
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skx opened this issue Oct 17, 2022 · 1 comment · Fixed by #59
Closed

Add missing function /= #53

skx opened this issue Oct 17, 2022 · 1 comment · Fixed by #59

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@skx
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skx commented Oct 17, 2022 •
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Again from the fine guide

The /= function, conversely, returns true only if all its arguments are different values.

(/= 1 1)        ==> NIL
(/= 1 2)        ==> T
(/= 1 2 3)      ==> T
(/= 1 2 3 1)    ==> NIL
(/= 1 2 3 1.0)  ==> NIL
@skx
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skx commented Oct 17, 2022

Interestingly that same section says the "(= 1 2 3 4 5 ... 9)" should work.

(i.e. We should add support for more than two operands.)

skx added a commit that referenced this issue Oct 17, 2022
@skx
Allow (= ...) to accept multiple arguments.
65099be 
The numerical-equality function "(=..)" previously supported only
two values.  Now we support multiple values.

This updates #53, but does not close it until we've implemented
the corresponding inequality test.
@skx skx mentioned this issue Oct 17, 2022
Merged
skx added a commit that referenced this issue Oct 17, 2022
@skx
Added /= function.
e19cd2e 
This is a weird one, but it closes #53 by allowing a numerical
inequality test to be carried out:

* If any argument has been seen before, return false.
* If all arguments are unique, return true.

This closes #53.
@skx skx mentioned this issue Oct 17, 2022
Merged
@skx skx closed this as completed in #59 Oct 17, 2022
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Added /= function. skx/yal
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