Record.ts.md

title	nav_order	parent
Record.ts	88	Modules

Record overview

Added in v2.0.0

---

Table of contents

• Compactable
  • compact
  • separate
• Filterable
  • filter
  • filterMap
  • partition
  • partitionMap
• Foldable
  • foldMap
  • reduce
  • reduceRight
• Witherable
  • wilt
  • wither
• combinators
  • difference
  • flap
  • intersection
  • union
  • upsertAt
• instances
  • Compactable
  • Filterable
  • FilterableWithIndex
  • Functor
  • FunctorWithIndex
  • URI
  • URI (type alias)
  • getDifferenceMagma
  • getEq
  • getFoldable
  • getFoldableWithIndex
  • getIntersectionSemigroup
  • getMonoid
  • getShow
  • getTraversable
  • getTraversableWithIndex
  • getUnionMonoid
  • getUnionSemigroup
  • getWitherable
  • FoldableWithIndex
  • Foldable
  • TraversableWithIndex
  • Traversable
  • Witherable
  • record
• utils
  • collect
  • deleteAt
  • elem
  • every
  • filterCollect
  • filterMapWithIndex
  • filterWithIndex
  • foldMapWithIndex
  • fromFoldable
  • fromFoldableMap
  • has
  • isEmpty
  • isSubrecord
  • keys
  • lookup
  • map
  • mapWithIndex
  • modifyAt
  • partitionMapWithIndex
  • partitionWithIndex
  • pop
  • reduceRightWithIndex
  • reduceWithIndex
  • sequence
  • singleton
  • size
  • some
  • toArray
  • toUnfoldable
  • traverse
  • traverseWithIndex
  • updateAt
  • empty
  • hasOwnProperty (function)
  • insertAt

---

Compactable

compact

Signature

export declare const compact: <A>(fa: Record<string, Option<A>>) => Record<string, A>

Added in v2.0.0

separate

Signature

export declare const separate: <A, B>(
  fa: Record<string, Either<A, B>>
) => Separated<Record<string, A>, Record<string, B>>

Added in v2.0.0

Filterable

filter

Signature

export declare const filter: {
  <A, B extends A>(refinement: Refinement<A, B>): (fa: Record<string, A>) => Record<string, B>
  <A>(predicate: Predicate<A>): <B extends A>(fb: Record<string, B>) => Record<string, B>
  <A>(predicate: Predicate<A>): (fa: Record<string, A>) => Record<string, A>
}

Added in v2.0.0

filterMap

Signature

export declare const filterMap: <A, B>(f: (a: A) => Option<B>) => (fa: Record<string, A>) => Record<string, B>

Added in v2.0.0

partition

Signature

export declare const partition: {
  <A, B extends A>(refinement: Refinement<A, B>): (
    fa: Record<string, A>
  ) => Separated<Record<string, A>, Record<string, B>>
  <A>(predicate: Predicate<A>): <B extends A>(fb: Record<string, B>) => Separated<Record<string, B>, Record<string, B>>
  <A>(predicate: Predicate<A>): (fa: Record<string, A>) => Separated<Record<string, A>, Record<string, A>>
}

Added in v2.0.0

partitionMap

Signature

export declare const partitionMap: <A, B, C>(
  f: (a: A) => Either<B, C>
) => (fa: Record<string, A>) => Separated<Record<string, B>, Record<string, C>>

Added in v2.0.0

Foldable

foldMap

Signature

export declare function foldMap(
  O: Ord<string>
): <M>(M: Monoid<M>) => <A>(f: (a: A) => M) => (fa: Record<string, A>) => M
export declare function foldMap<M>(M: Monoid<M>): <A>(f: (a: A) => M) => (fa: Record<string, A>) => M

Added in v2.0.0

reduce

Signature

export declare function reduce(O: Ord<string>): <A, B>(b: B, f: (b: B, a: A) => B) => (fa: Record<string, A>) => B
export declare function reduce<A, B>(b: B, f: (b: B, a: A) => B): (fa: Record<string, A>) => B

Added in v2.0.0

reduceRight

Signature

export declare function reduceRight(O: Ord<string>): <A, B>(b: B, f: (a: A, b: B) => B) => (fa: Record<string, A>) => B
export declare function reduceRight<A, B>(b: B, f: (a: A, b: B) => B): (fa: Record<string, A>) => B

Added in v2.0.0

Witherable

wilt

Signature

export declare const wilt: PipeableWilt1<'Record'>

Added in v2.6.5

wither

Signature

export declare const wither: PipeableWither1<'Record'>

Added in v2.6.5

combinators

difference

Signature

export declare const difference: <A>(second: Record<string, A>) => (first: Record<string, A>) => Record<string, A>

Added in v2.11.0

flap

Derivable from Functor.

Signature

export declare const flap: <A>(a: A) => <B>(fab: Record<string, (a: A) => B>) => Record<string, B>

Added in v2.10.0

intersection

Signature

export declare const intersection: <A>(
  M: Magma<A>
) => (second: Record<string, A>) => (first: Record<string, A>) => Record<string, A>

Added in v2.11.0

union

Signature

export declare const union: <A>(
  M: Magma<A>
) => (second: Record<string, A>) => (first: Record<string, A>) => Record<string, A>

Added in v2.11.0

upsertAt

Insert or replace a key/value pair in a Record.

Signature

export declare const upsertAt: <A>(k: string, a: A) => (r: Record<string, A>) => Record<string, A>

Added in v2.10.0

instances

Compactable

Signature

export declare const Compactable: Compactable1<'Record'>

Added in v2.7.0

Filterable

Signature

export declare const Filterable: Filterable1<'Record'>

Added in v2.7.0

FilterableWithIndex

Signature

export declare const FilterableWithIndex: FilterableWithIndex1<'Record', string>

Added in v2.7.0

Functor

Signature

export declare const Functor: Functor1<'Record'>

Added in v2.7.0

FunctorWithIndex

Signature

export declare const FunctorWithIndex: FunctorWithIndex1<'Record', string>

Added in v2.7.0

URI

Signature

export declare const URI: 'Record'

Added in v2.0.0

URI (type alias)

Signature

export type URI = typeof URI

Added in v2.0.0

getDifferenceMagma

Signature

export declare const getDifferenceMagma: <A>() => Magma<Record<string, A>>

Added in v2.11.0

getEq

Signature

export declare const getEq: <K extends string, A>(E: Eq<A>) => Eq<Record<K, A>>

Added in v2.0.0

getFoldable

Signature

export declare const getFoldable: (O: Ord<string>) => Foldable1<URI>

Added in v2.11.0

getFoldableWithIndex

Signature

export declare const getFoldableWithIndex: (O: Ord<string>) => FoldableWithIndex1<URI, string>

Added in v2.11.0

getIntersectionSemigroup

Signature

export declare const getIntersectionSemigroup: <A>(S: Semigroup<A>) => Semigroup<Record<string, A>>

Added in v2.11.0

getMonoid

Returns a Monoid instance for Records given a Semigroup instance for their values.

Signature

export declare const getMonoid: <K extends string, A>(S: Semigroup<A>) => Monoid<Record<K, A>>

Example

import { SemigroupSum } from 'fp-ts/number'
import { getMonoid } from 'fp-ts/Record'

const M = getMonoid(SemigroupSum)
assert.deepStrictEqual(M.concat({ foo: 123 }, { foo: 456 }), { foo: 579 })

Added in v2.0.0

getShow

Signature

export declare function getShow(O: Ord<string>): <A>(S: Show<A>) => Show<Record<string, A>>
export declare function getShow<A>(S: Show<A>): Show<Record<string, A>>

Added in v2.0.0

getTraversable

Signature

export declare const getTraversable: (O: Ord<string>) => Traversable1<URI>

Added in v2.11.0

getTraversableWithIndex

Signature

export declare const getTraversableWithIndex: (O: Ord<string>) => TraversableWithIndex1<URI, string>

Added in v2.11.0

getUnionMonoid

Signature

export declare const getUnionMonoid: <A>(S: Semigroup<A>) => Monoid<Record<string, A>>

Added in v2.11.0

getUnionSemigroup

Signature

export declare const getUnionSemigroup: <A>(S: Semigroup<A>) => Semigroup<Record<string, A>>

Added in v2.11.0

getWitherable

Signature

export declare const getWitherable: (O: Ord<string>) => Witherable1<URI>

Added in v2.11.0

FoldableWithIndex

Use getFoldableWithIndex instead.

Signature

export declare const FoldableWithIndex: FoldableWithIndex1<'Record', string>

Added in v2.7.0

Foldable

Use getFoldable instead.

Signature

export declare const Foldable: Foldable1<'Record'>

Added in v2.7.0

TraversableWithIndex

Use the getTraversableWithIndex instead.

Signature

export declare const TraversableWithIndex: TraversableWithIndex1<'Record', string>

Added in v2.7.0

Traversable

Use getTraversable instead.

Signature

export declare const Traversable: Traversable1<'Record'>

Added in v2.7.0

Witherable

Use getWitherable instead.

Signature

export declare const Witherable: Witherable1<'Record'>

Added in v2.7.0

record

Use small, specific instances instead.

Signature

export declare const record: FunctorWithIndex1<'Record', string> &
  FoldableWithIndex1<'Record', string> &
  FilterableWithIndex1<'Record', string> &
  TraversableWithIndex1<'Record', string> &
  Witherable1<'Record'>

Added in v2.0.0

utils

collect

Map a Record into an Array.

Signature

export declare function collect(
  O: Ord<string>
): <K extends string, A, B>(f: (k: K, a: A) => B) => (r: Record<K, A>) => Array<B>
export declare function collect<K extends string, A, B>(f: (k: K, a: A) => B): (r: Record<K, A>) => Array<B>

Example

import { collect } from 'fp-ts/Record'
import { Ord } from 'fp-ts/string'

const x: { readonly a: string; readonly b: boolean } = { a: 'c', b: false }
assert.deepStrictEqual(collect(Ord)((key, val) => ({ key: key, value: val }))(x), [
  { key: 'a', value: 'c' },
  { key: 'b', value: false },
])

Added in v2.0.0

deleteAt

Delete a key and value from a Record.

Signature

export declare function deleteAt<K extends string>(
  k: K
): <KS extends string, A>(r: Record<KS, A>) => Record<string extends K ? string : Exclude<KS, K>, A>

Added in v2.0.0

elem

Signature

export declare const elem: <A>(
  E: Eq<A>
) => { (a: A): (fa: Record<string, A>) => boolean; (a: A, fa: Record<string, A>): boolean }

Added in v2.0.0

every

Signature

export declare const every: <A>(predicate: Predicate<A>) => (r: Record<string, A>) => boolean

Added in v2.0.0

filterCollect

Map a Record into an Array passing a key/value pair to the iterating function and filtering out undesired results. The keys in the resulting record are sorted according to the passed instance of Ord<string>.

Signature

export declare const filterCollect: (
  O: Ord<string>
) => <K extends string, A, B>(f: (k: K, a: A) => Option<B>) => (r: Record<K, A>) => B[]

Example

import { none, some } from 'fp-ts/Option'
import { filterCollect } from 'fp-ts/Record'
import { Ord } from 'fp-ts/string'

const x: { readonly a: string; readonly b: boolean; readonly c: number } = { a: 'c', b: false, c: 123 }
assert.deepStrictEqual(
  filterCollect(Ord)((key, value) => (typeof value === 'boolean' ? none : some({ key, value })))(x),
  [
    { key: 'a', value: 'c' },
    { key: 'c', value: 123 },
  ]
)

Added in v2.12.0

filterMapWithIndex

Signature

export declare const filterMapWithIndex: <K extends string, A, B>(
  f: (key: K, a: A) => Option<B>
) => (fa: Record<K, A>) => Record<string, B>

Added in v2.0.0

filterWithIndex

Signature

export declare function filterWithIndex<K extends string, A, B extends A>(
  refinementWithIndex: RefinementWithIndex<K, A, B>
): (fa: Record<K, A>) => Record<string, B>
export declare function filterWithIndex<K extends string, A>(
  predicateWithIndex: PredicateWithIndex<K, A>
): <B extends A>(fb: Record<K, B>) => Record<string, B>
export declare function filterWithIndex<K extends string, A>(
  predicateWithIndex: PredicateWithIndex<K, A>
): (fa: Record<K, A>) => Record<string, A>

Added in v2.0.0

foldMapWithIndex

Signature

export declare function foldMapWithIndex(
  O: Ord<string>
): <M>(M: Monoid<M>) => <K extends string, A>(f: (k: K, a: A) => M) => (fa: Record<K, A>) => M
export declare function foldMapWithIndex<M>(
  M: Monoid<M>
): <K extends string, A>(f: (k: K, a: A) => M) => (fa: Record<K, A>) => M

Added in v2.0.0

fromFoldable

Create a Record from a foldable collection of key/value pairs, using the specified Magma to combine values for duplicate keys.

Signature

export declare function fromFoldable<F extends URIS3, A>(
  M: Magma<A>,
  F: Foldable3<F>
): <R, E>(fka: Kind3<F, R, E, [string, A]>) => Record<string, A>
export declare function fromFoldable<F extends URIS2, A>(
  M: Magma<A>,
  F: Foldable2<F>
): <E>(fka: Kind2<F, E, [string, A]>) => Record<string, A>
export declare function fromFoldable<F extends URIS, A>(
  M: Magma<A>,
  F: Foldable1<F>
): (fka: Kind<F, [string, A]>) => Record<string, A>
export declare function fromFoldable<F, A>(
  M: Magma<A>,
  F: FoldableHKT<F>
): (fka: HKT<F, [string, A]>) => Record<string, A>

Added in v2.0.0

fromFoldableMap

Create a Record from a foldable collection using the specified functions to

• map to key/value pairs
• combine values for duplicate keys.

Signature

export declare function fromFoldableMap<F extends URIS3, B>(
  M: Magma<B>,
  F: Foldable3<F>
): <R, E, A>(fa: Kind3<F, R, E, A>, f: (a: A) => [string, B]) => Record<string, B>
export declare function fromFoldableMap<F extends URIS2, B>(
  M: Magma<B>,
  F: Foldable2<F>
): <E, A>(fa: Kind2<F, E, A>, f: (a: A) => [string, B]) => Record<string, B>
export declare function fromFoldableMap<F extends URIS, B>(
  M: Magma<B>,
  F: Foldable1<F>
): <A>(fa: Kind<F, A>, f: (a: A) => [string, B]) => Record<string, B>
export declare function fromFoldableMap<F, B>(
  M: Magma<B>,
  F: FoldableHKT<F>
): <A>(fa: HKT<F, A>, f: (a: A) => [string, B]) => Record<string, B>

Example

import { last } from 'fp-ts/Semigroup'
import { Foldable, zip } from 'fp-ts/Array'
import { identity } from 'fp-ts/function'
import { fromFoldableMap } from 'fp-ts/Record'

export const zipObject = <K extends string, A>(keys: Array<K>, values: Array<A>): Record<K, A> =>
  fromFoldableMap(last<A>(), Foldable)(zip(keys, values), identity)

assert.deepStrictEqual(zipObject(['a', 'b'], [1, 2, 3]), { a: 1, b: 2 })

interface User {
  readonly id: string
  readonly name: string
}

const users: Array<User> = [
  { id: 'id1', name: 'name1' },
  { id: 'id2', name: 'name2' },
  { id: 'id1', name: 'name3' },
]

assert.deepStrictEqual(
  fromFoldableMap(last<User>(), Foldable)(users, (user) => [user.id, user]),
  {
    id1: { id: 'id1', name: 'name3' },
    id2: { id: 'id2', name: 'name2' },
  }
)

Added in v2.0.0

has

Test whether or not a key exists in a Record.

Note. This function is not pipeable because is a Refinement.

Signature

export declare const has: <K extends string>(k: string, r: Record<K, unknown>) => k is K

Added in v2.10.0

isEmpty

Test whether a Record is empty.

Signature

export declare const isEmpty: <A>(r: Record<string, A>) => boolean

Added in v2.0.0

isSubrecord

Test whether one Record contains all of the keys and values contained in another Record.

Signature

export declare const isSubrecord: <A>(
  E: Eq<A>
) => {
  (that: Record<string, A>): (me: Record<string, A>) => boolean
  (me: Record<string, A>, that: Record<string, A>): boolean
}

Added in v2.0.0

keys

Signature

export declare const keys: <K extends string>(r: Record<K, unknown>) => K[]

Added in v2.0.0

lookup

Lookup the value for a key in a Record.

Signature

export declare const lookup: {
  (k: string): <A>(r: Record<string, A>) => Option<A>
  <A>(k: string, r: Record<string, A>): Option<A>
}

Added in v2.0.0

map

Map a Record passing the values to the iterating function.

Signature

export declare const map: <A, B>(f: (a: A) => B) => <K extends string>(fa: Record<K, A>) => Record<K, B>

Added in v2.0.0

mapWithIndex

Map a Record passing the keys to the iterating function.

Signature

export declare const mapWithIndex: <K extends string, A, B>(f: (k: K, a: A) => B) => (fa: Record<K, A>) => Record<K, B>

Added in v2.0.0

modifyAt

Signature

export declare const modifyAt: <A>(
  k: string,
  f: (a: A) => A
) => <K extends string>(r: Record<K, A>) => Option<Record<K, A>>

Added in v2.0.0

partitionMapWithIndex

Signature

export declare const partitionMapWithIndex: <K extends string, A, B, C>(
  f: (key: K, a: A) => Either<B, C>
) => (fa: Record<K, A>) => Separated<Record<string, B>, Record<string, C>>

Added in v2.0.0

partitionWithIndex

Signature

export declare function partitionWithIndex<K extends string, A, B extends A>(
  refinementWithIndex: RefinementWithIndex<K, A, B>
): (fa: Record<K, A>) => Separated<Record<string, A>, Record<string, B>>
export declare function partitionWithIndex<K extends string, A>(
  predicateWithIndex: PredicateWithIndex<K, A>
): <B extends A>(fb: Record<K, B>) => Separated<Record<string, B>, Record<string, B>>
export declare function partitionWithIndex<K extends string, A>(
  predicateWithIndex: PredicateWithIndex<K, A>
): (fa: Record<K, A>) => Separated<Record<string, A>, Record<string, A>>

Added in v2.0.0

pop

Delete a key and value from a Record, returning the value as well as the subsequent Record.

Signature

export declare function pop<K extends string>(
  k: K
): <KS extends string, A>(r: Record<KS, A>) => Option<[A, Record<string extends K ? string : Exclude<KS, K>, A>]>

Added in v2.0.0

reduceRightWithIndex

Signature

export declare function reduceRightWithIndex(
  O: Ord<string>
): <K extends string, A, B>(b: B, f: (k: K, a: A, b: B) => B) => (fa: Record<K, A>) => B
export declare function reduceRightWithIndex<K extends string, A, B>(
  b: B,
  f: (k: K, a: A, b: B) => B
): (fa: Record<K, A>) => B

Added in v2.0.0

reduceWithIndex

Signature

export declare function reduceWithIndex(
  O: Ord<string>
): <K extends string, A, B>(b: B, f: (k: K, b: B, a: A) => B) => (fa: Record<K, A>) => B
export declare function reduceWithIndex<K extends string, A, B>(
  b: B,
  f: (k: K, b: B, a: A) => B
): (fa: Record<K, A>) => B

Added in v2.0.0

sequence

Signature

export declare function sequence<F extends URIS3>(
  F: Applicative3<F>
): <K extends string, R, E, A>(ta: Record<K, Kind3<F, R, E, A>>) => Kind3<F, R, E, Record<K, A>>
export declare function sequence<F extends URIS3, E>(
  F: Applicative3C<F, E>
): <K extends string, R, A>(ta: Record<K, Kind3<F, R, E, A>>) => Kind3<F, R, E, Record<K, A>>
export declare function sequence<F extends URIS2>(
  F: Applicative2<F>
): <K extends string, E, A>(ta: Record<K, Kind2<F, E, A>>) => Kind2<F, E, Record<K, A>>
export declare function sequence<F extends URIS2, E>(
  F: Applicative2C<F, E>
): <K extends string, A>(ta: Record<K, Kind2<F, E, A>>) => Kind2<F, E, Record<K, A>>
export declare function sequence<F extends URIS>(
  F: Applicative1<F>
): <K extends string, A>(ta: Record<K, Kind<F, A>>) => Kind<F, Record<K, A>>
export declare function sequence<F>(
  F: Applicative<F>
): <K extends string, A>(ta: Record<K, HKT<F, A>>) => HKT<F, Record<K, A>>

Added in v2.0.0

singleton

Create a Record with one key/value pair.

Signature

export declare const singleton: <A>(k: string, a: A) => Record<string, A>

Added in v2.0.0

size

Calculate the number of key/value pairs in a Record.

Signature

export declare const size: <A>(r: Record<string, A>) => number

Added in v2.0.0

some

Signature

export declare const some: <A>(predicate: (a: A) => boolean) => (r: Record<string, A>) => boolean

Added in v2.0.0

toArray

Get a sorted Array of the key/value pairs contained in a Record.

Signature

export declare const toArray: <K extends string, A>(r: Record<K, A>) => [K, A][]

Added in v2.0.0

toUnfoldable

Unfolds a Record into a list of key/value pairs.

Signature

export declare function toUnfoldable<F extends URIS>(
  U: Unfoldable1<F>
): <K extends string, A>(r: Record<K, A>) => Kind<F, [K, A]>
export declare function toUnfoldable<F>(U: Unfoldable<F>): <K extends string, A>(r: Record<K, A>) => HKT<F, [K, A]>

Added in v2.0.0

traverse

Signature

export declare function traverse<F extends URIS3>(
  F: Applicative3<F>
): <R, E, A, B>(f: (a: A) => Kind3<F, R, E, B>) => <K extends string>(ta: Record<K, A>) => Kind3<F, R, E, Record<K, B>>
export declare function traverse<F extends URIS3, E>(
  F: Applicative3C<F, E>
): <R, A, B>(f: (a: A) => Kind3<F, R, E, B>) => <K extends string>(ta: Record<K, A>) => Kind3<F, R, E, Record<K, B>>
export declare function traverse<F extends URIS2>(
  F: Applicative2<F>
): <E, A, B>(f: (a: A) => Kind2<F, E, B>) => <K extends string>(ta: Record<K, A>) => Kind2<F, E, Record<K, B>>
export declare function traverse<F extends URIS2, E>(
  F: Applicative2C<F, E>
): <A, B>(f: (a: A) => Kind2<F, E, B>) => <K extends string>(ta: Record<K, A>) => Kind2<F, E, Record<K, B>>
export declare function traverse<F extends URIS>(
  F: Applicative1<F>
): <A, B>(f: (a: A) => Kind<F, B>) => <K extends string>(ta: Record<K, A>) => Kind<F, Record<K, B>>
export declare function traverse<F>(
  F: Applicative<F>
): <A, B>(f: (a: A) => HKT<F, B>) => <K extends string>(ta: Record<K, A>) => HKT<F, Record<K, B>>

Added in v2.0.0

traverseWithIndex

Signature

export declare function traverseWithIndex<F extends URIS3>(
  F: Applicative3<F>
): <K extends string, R, E, A, B>(
  f: (k: K, a: A) => Kind3<F, R, E, B>
) => (ta: Record<K, A>) => Kind3<F, R, E, Record<K, B>>
export declare function traverseWithIndex<F extends URIS3, E>(
  F: Applicative3C<F, E>
): <K extends string, R, A, B>(
  f: (k: K, a: A) => Kind3<F, R, E, B>
) => (ta: Record<K, A>) => Kind3<F, R, E, Record<K, B>>
export declare function traverseWithIndex<F extends URIS2>(
  F: Applicative2<F>
): <K extends string, E, A, B>(f: (k: K, a: A) => Kind2<F, E, B>) => (ta: Record<K, A>) => Kind2<F, E, Record<K, B>>
export declare function traverseWithIndex<F extends URIS2, E>(
  F: Applicative2C<F, E>
): <K extends string, A, B>(f: (k: K, a: A) => Kind2<F, E, B>) => (ta: Record<K, A>) => Kind2<F, E, Record<K, B>>
export declare function traverseWithIndex<F extends URIS>(
  F: Applicative1<F>
): <K extends string, A, B>(f: (k: K, a: A) => Kind<F, B>) => (ta: Record<K, A>) => Kind<F, Record<K, B>>
export declare function traverseWithIndex<F>(
  F: Applicative<F>
): <K extends string, A, B>(f: (k: K, a: A) => HKT<F, B>) => (ta: Record<K, A>) => HKT<F, Record<K, B>>

Added in v2.0.0

updateAt

Signature

export declare const updateAt: <A>(k: string, a: A) => <K extends string>(r: Record<K, A>) => Option<Record<K, A>>

Added in v2.0.0

empty

Use a new {} instead.

Signature

export declare const empty: Record<string, never>

Added in v2.0.0

hasOwnProperty (function)

Use has instead.

Signature

export declare const hasOwnProperty: <K extends string>(k: string, r: Record<K, unknown>) => k is K

Added in v2.0.0

insertAt

Use upsertAt instead.

Signature

export declare const insertAt: <A>(k: string, a: A) => (r: Record<string, A>) => Record<string, A>

Added in v2.0.0