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Fix signum implementation #280

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Merged
merged 12 commits into from
Mar 16, 2022
Merged

Fix signum implementation #280

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95741d1
Fix signum implementation
JordanMartinez Feb 13, 2022
80447ea
Add changelog entry
JordanMartinez Feb 13, 2022
64119e5
Reimplement w/o 'otherwise'
JordanMartinez Feb 13, 2022
478203e
Apply suggestions from code review
JordanMartinez Mar 3, 2022
afa818b
Update src/Data/Ord.purs
JordanMartinez Mar 3, 2022
bab0a84
Adjust doc comment to use sized zeros rendering
JordanMartinez Mar 3, 2022
c9c20b0
Add test for signum
JordanMartinez Mar 3, 2022
c042347
Add missing period.
JordanMartinez Mar 3, 2022
ab1a78a
Ensure signum test functions correctly
JordanMartinez Mar 3, 2022
047c8a3
Do test via `show (1.0/zero)` with clarifying test
JordanMartinez Mar 3, 2022
c85d8eb
Merge remote-tracking branch 'origin/master' into fix-signum
JordanMartinez Mar 11, 2022
2c8a023
Merge branch 'master' into fix-signum
JordanMartinez Mar 16, 2022
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6 changes: 6 additions & 0 deletions test/Test/Main.js
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Expand Up @@ -42,3 +42,9 @@ exports.testNumberShow = function(showNumber) {
]);
};
};

exports.objectIs = function(l) {
return function(r) {
return Object.is(l, r);
};
};
9 changes: 7 additions & 2 deletions test/Test/Main.purs
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Expand Up @@ -155,5 +155,10 @@ testRecordInstances = do

testSignum :: AlmostEff
testSignum = do
assert "signum positive zero" $ signum 0.0 == 0.0
assert "signum negative zero" $ signum (-0.0) == (-0.0)
assert "signum positive zero" $ objectIs (signum 0.0) 0.0
assert "signum negative zero" $ objectIs (signum (-0.0)) (-0.0)

-- Seems to be only way to check whether zero is `-0.0` or `0.0`
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@hdgarrood hdgarrood Mar 3, 2022

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I forgot that our show doesn't distinguish negative and positive zero. But, you can still distinguish them without the FFI:

show (1.0/0.0) == "Infinity"
show (1.0/(-0.0)) == "-Infinity"

-- See "Case 2" in
-- https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/is#using_object.is
foreign import objectIs :: Number -> Number -> Boolean