Function findKey

findKey<T>(array: T[], predicate: ArrayIteratee<T, boolean>): undefined | string
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: 16,048 bytes
- Micro-dash: 377 bytes
Type Parameters
- T
Parameters
- array: T[]
- predicate: ArrayIteratee<T, boolean>
Returns undefined | string
- 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: 16,048 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: 16,048 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>,
): undefined | Cast<keyof T, string>
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: 16,048 bytes
- Micro-dash: 377 bytes
Type Parameters
- T
Parameters
- object: Nil | T
- predicate: ObjectIteratee<T, boolean>
Returns undefined | Cast<keyof T, string>
- Defined in object/find-key.ts:60

Function findKey

Type Parameters

Parameters

Returns undefined | string

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 undefined | Cast<keyof T, string>

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)