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Coerce findLastIndex and lastIndexOf fromIndex parameter to integer (#4440)

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* Enable lastIndexOf, findLast and findLastIndex

* Coerce findLastIndex fromIndex parameter to integer

* Coerce lastIndexOf fromIndex parameter to integer
This commit is contained in:
Luiz Américo
2019-08-24 13:44:00 -03:00
committed by John-David Dalton
parent ed4b3a2ddb
commit 3ebb38d389
4 changed files with 15 additions and 4 deletions
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6
findLastIndex.js
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@@ -1,4 +1,5 @@
import baseFindIndex from './.internal/baseFindIndex.js'
import toInteger from './toInteger.js'
/**
* This method is like `findIndex` except that it iterates over elements
@@ -29,9 +30,10 @@ function findLastIndex(array, predicate, fromIndex) {
}
let index = length - 1
if (fromIndex !== undefined) {
index = toInteger(fromIndex)
index = fromIndex < 0
? Math.max(length + fromIndex, 0)
: Math.min(fromIndex, length - 1)
? Math.max(length + index, 0)
: Math.min(index, length - 1)
}
return baseFindIndex(array, predicate, index, true)
}