Function findKey

findKey<T>(array: T[], predicate: ArrayIteratee<T, boolean>): string | undefined
This function is like find except that it returns the key of the first element predicate returns truthy for instead of the element itself.

Contribution to minified bundle size, when it is the only function imported:
- Lodash: 16,054 bytes
- Micro-dash: 377 bytes
Type Parameters
- T
Parameters
- array: T[]
- predicate: ArrayIteratee<T, boolean>
Returns string | undefined
- Defined in object/find-key.ts:36
findKey<I, T extends {}, O>(
    object: I,
    predicate: ValueNarrowingIteratee<T, O>,
):
    | IfCouldBe<I, Nil, undefined>
    | PossibleValueMatches<T, O>
    | (DefiniteValueMatches<T, O> extends never ? undefined : never)
This function is like find except that it returns the key of the first element predicate returns truthy for instead of the element itself.

Contribution to minified bundle size, when it is the only function imported:
- Lodash: 16,054 bytes
- Micro-dash: 377 bytes
Type Parameters
- I
- T extends {}
- O
Parameters
- object: I
- predicate: ValueNarrowingIteratee<T, O>
Returns
    | IfCouldBe<I, Nil, undefined>
    | PossibleValueMatches<T, O>
    | (DefiniteValueMatches<T, O> extends never ? undefined : never)
- Defined in object/find-key.ts:42
findKey<I, T extends {}, O>(
    object: I,
    predicate: KeyNarrowingIteratee<T, O>,
):
    | IfCouldBe<I, Nil, undefined>
    | PossibleKeyMatch<T, O>
    | (DefiniteKeyMatch<T, O> extends never ? undefined : never)
This function is like find except that it returns the key of the first element predicate returns truthy for instead of the element itself.

Contribution to minified bundle size, when it is the only function imported:
- Lodash: 16,054 bytes
- Micro-dash: 377 bytes
Type Parameters
- I
- T extends {}
- O
Parameters
- object: I
- predicate: KeyNarrowingIteratee<T, O>
Returns
    | IfCouldBe<I, Nil, undefined>
    | PossibleKeyMatch<T, O>
    | (DefiniteKeyMatch<T, O> extends never ? undefined : never)
- Defined in object/find-key.ts:51
findKey<T>(
object: Nil | T,
predicate: ObjectIteratee<T, boolean>,
): Cast<keyof T, string> | undefined
This function is like find except that it returns the key of the first element predicate returns truthy for instead of the element itself.

Contribution to minified bundle size, when it is the only function imported:
- Lodash: 16,054 bytes
- Micro-dash: 377 bytes
Type Parameters
- T
Parameters
- object: Nil | T
- predicate: ObjectIteratee<T, boolean>
Returns Cast<keyof T, string> | undefined
- Defined in object/find-key.ts:60

Function findKey

Type Parameters

Parameters

Returns string | undefined

Type Parameters

Parameters

Returns | IfCouldBe<I, Nil, undefined> | PossibleValueMatches<T, O> | (DefiniteValueMatches<T, O> extends never ? undefined : never)

Type Parameters

Parameters

Returns | IfCouldBe<I, Nil, undefined> | PossibleKeyMatch<T, O> | (DefiniteKeyMatch<T, O> extends never ? undefined : never)

Type Parameters

Parameters

Returns Cast<keyof T, string> | undefined

Settings

Returns
| IfCouldBe<I, Nil, undefined>
| PossibleValueMatches<T, O>
| (DefiniteValueMatches<T, O> extends never ? undefined : never)

Returns
| IfCouldBe<I, Nil, undefined>
| PossibleKeyMatch<T, O>
| (DefiniteKeyMatch<T, O> extends never ? undefined : never)