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array.ts
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22 lines (21 loc) · 873 Bytes
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/**
* Returns the index of the last element in the array where predicate is true, and -1
* otherwise.
* @param array The source array to search in
* @param predicate find calls predicate once for each element of the array, in descending
* order, until it finds one where predicate returns true. If such an element is found,
* findLastIndex immediately returns that element index. Otherwise, findLastIndex returns -1.
*/
export function findLastIndex<T>(array: Array<T>, predicate: (value: T, index: number, obj: T[]) => boolean): number {
let l = array.length
while (l--) {
if (predicate(array[l], l, array)) {
return l
}
}
return -1
}
export function findLast<T>(array: Array<T>, predicate: (value: T, index: number, obj: T[]) => boolean): T | undefined {
const index = findLastIndex(array, predicate)
return index === -1 ? undefined : array[index]
}