Fixed out of spec behavior of array.reduce#731
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ark120202
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Oct 3, 2019
| @@ -1,20 +1,23 @@ | |||
| /** @vararg */ | |||
| interface VarArg<T> extends Array<T> {} | |||
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Suggested change
| interface VarArg<T> extends Array<T> {} | |
| interface Vararg<T> extends Array<T> {} |
| let accumulator = initial; | ||
| if (initial === undefined) { | ||
| let accumulator = select(1, ...initial); | ||
| if (accumulator === undefined) { |
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It doesn't look like that would fix that issue. The test case doesn't cover it, but:
['a', 'b'].reduce((a, b) => console.log(a, b));
// "a" "b"
['a', 'b'].reduce((a, b) => console.log(a, b), undefined);
// undefined "a"
// undefined "b"| const len = arr.length; | ||
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| if (len === 0 && initial === undefined) { | ||
| if (len === 0 && select("#", ...initial) === 0) { |
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That's out of scope of this PR, but we probably want to transform vararg.length to select("#", ...) in general
ark120202
reviewed
Oct 5, 2019
| @@ -1,27 +1,35 @@ | |||
| /** @vararg */ | |||
| interface Vararg<T> extends Array<T> {} | |||
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I think we should move it to something like declarations/tstl.d.ts
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| if (len === 0 && initial === undefined) { | ||
| const initialValuePresent = select("#", ...initial) !== 0; | ||
| if (len === 0 && !initialValuePresent) { |
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Thoughts on moving that check to a condition below and removing initialValuePresent variable?
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| test("array.reduce undefined returning callback", () => { | ||
| util.testFunction` | ||
| const calls: {a: void, b: string}[] = []; |
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Suggested change
| const calls: {a: void, b: string}[] = []; | |
| const calls: Array<{ a: void, b: string }> = []; |
ark120202
approved these changes
Oct 5, 2019
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Fixes #727