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Modify output of some math operators for empty inputs (#9337)

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* Initial commit

* Adapt test to new behavior
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yaisog 2025-10-29 12:57:39 +01:00 • committed by GitHub
parent 059978ec63
commit d58eec47c0
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2 changed files with 6 additions and 2 deletions
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4
core/modules/filters/math.js
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@ -217,6 +217,10 @@ function makeNumericReducingOperator(fnCalc,initialValue,fnFinal) {
source(function(tiddler,title) {
result.push($tw.utils.parseNumber(title));
});
// We return an empty array if there are no input titles
if(result.length === 0) {
return [];
}
var value = result.reduce(function(accumulator,currentValue) {
return fnCalc(accumulator,currentValue);
},initialValue);

4
editions/test/tiddlers/tests/test-prefixes-filter.js
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@ -372,13 +372,13 @@ describe("'reduce' and 'intersection' filter prefix tests", function() {
it("should handle the variance operator", function() {
expect(parseFloat(wiki.filterTiddlers("[tag[shopping]get[price]variance[]]").join(","))).toBeCloseTo(2.92);
expect(parseFloat(wiki.filterTiddlers("[tag[food]get[price]variance[]]").join(","))).toBeCloseTo(3.367);
expect(wiki.filterTiddlers(" +[variance[]]").toString()).toBe("NaN");
expect(wiki.filterTiddlers(" +[variance[]]").toString()).toBe("");
});
it("should handle the standard-deviation operator", function() {
expect(parseFloat(wiki.filterTiddlers("[tag[shopping]get[price]standard-deviation[]]").join(","))).toBeCloseTo(1.71);
expect(parseFloat(wiki.filterTiddlers("[tag[food]get[price]standard-deviation[]]").join(","))).toBeCloseTo(1.835);
expect(wiki.filterTiddlers(" +[standard-deviation[]]").toString()).toBe("NaN");
expect(wiki.filterTiddlers(" +[standard-deviation[]]").toString()).toBe("");
});
it("should handle the :intersection prefix", function() {