Editorial: Fix off-by-1 error in PartitionPattern#392
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leobalter merged 1 commit intotc39:masterfrom Jan 8, 2020
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Gotcha, thanks for the context! |
Right now after the loop finishes, the remainder is
`pattern.substring(nextIndex + 1, len)` (bc it's exclusive) but should
be `pattern.substring(nextIndex, len)` instead since `nextIndex` is
already set to `endIndex + 1` in the loop.
Take `AA{0}BB` as an example, after the loop finishes:
- beginIndex = -1
- endIndex = 4
- nextIndex = 5
so `pattern.substring(5, 7)` yields `BB` (correct) vs the old behavior
would just yield `B`
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Has consensus according to December ECMA-402. What further action is required on this Editorial PR? |
leobalter
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Jan 8, 2020
leobalter
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I'm renaming the PR to reflect it's fixing a typo mostly. |
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Right now after the loop finishes, the remainder is
pattern.substring(nextIndex + 1, len)(bc it's exclusive) but shouldbe
pattern.substring(nextIndex, len)instead sincenextIndexisalready set to
endIndex + 1in the loop.Take
AA{0}BBas an example, after the loop finishes:so
pattern.substring(5, 7)yieldsBB(correct) vs the old behaviorwould just yield
BReference impl: https://github.com/formatjs/formatjs/blob/master/packages/intl-utils/src/polyfill-utils.ts#L220
Reference test: https://github.com/formatjs/formatjs/blob/master/packages/intl-utils/tests/polyfill-utils.ts