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zuzusik opened this issue Feb 15, 2017 · 4 comments
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Array(n) is spreaded incorrectly in arrays #14088

zuzusik opened this issue Feb 15, 2017 · 4 comments
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@zuzusik
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zuzusik commented Feb 15, 2017 •
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TypeScript Version: 2.1.6

Code

[...Array(5)]

Expected behavior:
Array filled with undefined 5 times (this is how it should be by the spec and how Chrome/FF/Safari do it)

Actual behavior:
Empty array with length set to 5
@alex3165
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Typescript compile it to Array(5).slice(); https://www.typescriptlang.org/play/#src=%5B...Array(5)%5D%0D%0A

@zuzusik
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zuzusik commented Feb 15, 2017

@alex3165 yes, it does, and this is wrong because it gives non spec compliant result

@alex3165
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@zuzusik Agreed, it is not really expected

@zuzusik zuzusik changed the title Array spreads Array(n) incorrectly Array(n) is spreaded incorrectly in arrays Feb 15, 2017
@mhegazy
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mhegazy commented Feb 15, 2017

Duplicate of #8856

@mhegazy mhegazy added the Duplicate An existing issue was already created label Feb 15, 2017
@mhegazy mhegazy closed this as completed Apr 19, 2017
@aik-jahoda aik-jahoda mentioned this issue Sep 1, 2017
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