Docs / API / Belt / Map / Dict

Dict

This module separates identity from data, it is a bit more verbose but slightly more efficient due to the fact that there is no need to pack identity and data back after each operation.

Advanced usage only

t

RESCRIPT

type t<'key, 'value, 'id>

cmp

RESCRIPT

type cmp<'key, 'id> = Belt_Id.cmp<'key, 'id>

empty

RESCRIPT

let empty: t<'k, 'v, 'id>

isEmpty

RESCRIPT

let isEmpty: t<'k, 'v, 'id> => bool

has

RESCRIPT

let has: (t<'k, 'a, 'id>, 'k, ~cmp: cmp<'k, 'id>) => bool

cmpU

RESCRIPT

let cmpU: (
  t<'k, 'v, 'id>,
  t<'k, 'v, 'id>,
  ~kcmp: cmp<'k, 'id>,
  ~vcmp: ('v, 'v) => int,
) => int

cmp

RESCRIPT

let cmp: (
  t<'k, 'v, 'id>,
  t<'k, 'v, 'id>,
  ~kcmp: cmp<'k, 'id>,
  ~vcmp: ('v, 'v) => int,
) => int

eqU

RESCRIPT

let eqU: (
  t<'k, 'a, 'id>,
  t<'k, 'a, 'id>,
  ~kcmp: cmp<'k, 'id>,
  ~veq: ('a, 'a) => bool,
) => bool

eq

RESCRIPT

let eq: (
  t<'k, 'a, 'id>,
  t<'k, 'a, 'id>,
  ~kcmp: cmp<'k, 'id>,
  ~veq: ('a, 'a) => bool,
) => bool

eq(m1, m2, cmp) tests whether the maps m1 and m2 are equal, that is, contain equal keys and associate them with equal data. cmp is the equality predicate used to compare the data associated with the keys.

findFirstByU

RESCRIPT

let findFirstByU: (t<'k, 'v, 'id>, ('k, 'v) => bool) => option<('k, 'v)>

findFirstBy

RESCRIPT

let findFirstBy: (t<'k, 'v, 'id>, ('k, 'v) => bool) => option<('k, 'v)>

findFirstBy(m, p) uses function f to find the first key value pair to match predicate p.

Examples

RESCRIPT
module IntCmp = Belt.Id.MakeComparable({
    type t = int
    let cmp = Pervasives.compare
})

let s0 = Belt.Map.Dict.fromArray([(4, "4"), (1, "1"), (2, "2"), (3, "3")], ~cmp=IntCmp.cmp)

Belt.Map.Dict.findFirstBy(s0, (k, _) => k == 4) == Some((4, "4"))

forEachU

RESCRIPT

let forEachU: (t<'k, 'a, 'id>, ('k, 'a) => unit) => unit

forEach

RESCRIPT

let forEach: (t<'k, 'a, 'id>, ('k, 'a) => unit) => unit

forEach(m, f) applies f to all bindings in map m. f receives the key as first argument, and the associated value as second argument. The bindings are passed to f in increasing order with respect to the ordering over the type of the keys.

reduceU

RESCRIPT

let reduceU: (t<'k, 'a, 'id>, 'b, ('b, 'k, 'a) => 'b) => 'b

reduce

RESCRIPT

let reduce: (t<'k, 'a, 'id>, 'b, ('b, 'k, 'a) => 'b) => 'b

reduce(m, a, f) computes f(kN, dN ... f(k1, d1, a)...), where k1 ... kN are the keys of all bindings in m (in increasing order), and d1 ... dN are the associated data.

everyU

RESCRIPT

let everyU: (t<'k, 'a, 'id>, ('k, 'a) => bool) => bool

every

RESCRIPT

let every: (t<'k, 'a, 'id>, ('k, 'a) => bool) => bool

every(m, p) checks if all the bindings of the map satisfy the predicate p. Order unspecified

someU

RESCRIPT

let someU: (t<'k, 'a, 'id>, ('k, 'a) => bool) => bool

some

RESCRIPT

let some: (t<'k, 'a, 'id>, ('k, 'a) => bool) => bool

some(m, p) checks if at least one binding of the map satisfy the predicate p. Order unspecified

size

RESCRIPT

let size: t<'k, 'a, 'id> => int

toList

RESCRIPT

let toList: t<'k, 'a, 'id> => list<('k, 'a)>

In increasing order.

toArray

RESCRIPT

let toArray: t<'k, 'a, 'id> => array<('k, 'a)>

fromArray

RESCRIPT

let fromArray: (array<('k, 'a)>, ~cmp: cmp<'k, 'id>) => t<'k, 'a, 'id>

keysToArray

RESCRIPT

let keysToArray: t<'k, 'a, 'id> => array<'k>

valuesToArray

RESCRIPT

let valuesToArray: t<'k, 'a, 'id> => array<'a>

minKey

RESCRIPT

let minKey: t<'k, 'a, 'b> => option<'k>

minKeyUndefined

RESCRIPT

let minKeyUndefined: t<'k, 'a, 'b> => Js.undefined<'k>

maxKey

RESCRIPT

let maxKey: t<'k, 'a, 'b> => option<'k>

maxKeyUndefined

RESCRIPT

let maxKeyUndefined: t<'k, 'a, 'b> => Js.undefined<'k>

minimum

RESCRIPT

let minimum: t<'k, 'a, 'b> => option<('k, 'a)>

minUndefined

RESCRIPT

let minUndefined: t<'k, 'a, 'b> => Js.undefined<('k, 'a)>

maximum

RESCRIPT

let maximum: t<'k, 'a, 'b> => option<('k, 'a)>

maxUndefined

RESCRIPT

let maxUndefined: t<'k, 'a, 'b> => Js.undefined<('k, 'a)>

get

RESCRIPT

let get: (t<'k, 'a, 'id>, 'k, ~cmp: cmp<'k, 'id>) => option<'a>

getUndefined

RESCRIPT

let getUndefined: (t<'k, 'a, 'id>, 'k, ~cmp: cmp<'k, 'id>) => Js.undefined<'a>

getWithDefault

RESCRIPT

let getWithDefault: (t<'k, 'a, 'id>, 'k, 'a, ~cmp: cmp<'k, 'id>) => 'a

getExn

RESCRIPT

let getExn: (t<'k, 'a, 'id>, 'k, ~cmp: cmp<'k, 'id>) => 'a

checkInvariantInternal

RESCRIPT

let checkInvariantInternal: t<'a, 'b, 'c> => unit

remove

RESCRIPT

let remove: (t<'a, 'b, 'id>, 'a, ~cmp: cmp<'a, 'id>) => t<'a, 'b, 'id>

remove(m, x) returns a map containing the same bindings as m, except for x which is unbound in the returned map.

removeMany

RESCRIPT

let removeMany: (
  t<'a, 'b, 'id>,
  array<'a>,
  ~cmp: cmp<'a, 'id>,
) => t<'a, 'b, 'id>

set

RESCRIPT

let set: (
  t<'a, 'b, 'id>,
  'a,
  'b,
  ~cmp: cmp<'a, 'id>,
) => t<'a, 'b, 'id>

set(m, x, y) returns a map containing the same bindings as m, plus a binding of x to y. If x was already bound in m, its previous binding disappears.

updateU

RESCRIPT

let updateU: (
  t<'a, 'b, 'id>,
  'a,
  option<'b> => option<'b>,
  ~cmp: cmp<'a, 'id>,
) => t<'a, 'b, 'id>

update

RESCRIPT

let update: (
  t<'a, 'b, 'id>,
  'a,
  option<'b> => option<'b>,
  ~cmp: cmp<'a, 'id>,
) => t<'a, 'b, 'id>

mergeU

RESCRIPT

let mergeU: (
  t<'a, 'b, 'id>,
  t<'a, 'c, 'id>,
  ('a, option<'b>, option<'c>) => option<'d>,
  ~cmp: cmp<'a, 'id>,
) => t<'a, 'd, 'id>

merge

RESCRIPT

let merge: (
  t<'a, 'b, 'id>,
  t<'a, 'c, 'id>,
  ('a, option<'b>, option<'c>) => option<'d>,
  ~cmp: cmp<'a, 'id>,
) => t<'a, 'd, 'id>

merge(m1, m2, f) computes a map whose keys is a subset of keys of m1 and of m2. The presence of each such binding, and the corresponding value, is determined with the function f.

mergeMany

RESCRIPT

let mergeMany: (
  t<'a, 'b, 'id>,
  array<('a, 'b)>,
  ~cmp: cmp<'a, 'id>,
) => t<'a, 'b, 'id>

keepU

RESCRIPT

let keepU: (t<'k, 'a, 'id>, ('k, 'a) => bool) => t<'k, 'a, 'id>

keep

RESCRIPT

let keep: (t<'k, 'a, 'id>, ('k, 'a) => bool) => t<'k, 'a, 'id>

keep(m, p) returns the map with all the bindings in m that satisfy predicate p.

partitionU

RESCRIPT

let partitionU: (
  t<'k, 'a, 'id>,
  ('k, 'a) => bool,
) => (t<'k, 'a, 'id>, t<'k, 'a, 'id>)

partition

RESCRIPT

let partition: (
  t<'k, 'a, 'id>,
  ('k, 'a) => bool,
) => (t<'k, 'a, 'id>, t<'k, 'a, 'id>)

partition(m, p) returns a pair of maps (m1, m2), where m1 contains all the bindings of s that satisfy the predicate p, and m2 is the map with all the bindings of s that do not satisfy p.

split

RESCRIPT

let split: (
  t<'a, 'b, 'id>,
  'a,
  ~cmp: cmp<'a, 'id>,
) => ((t<'a, 'b, 'id>, t<'a, 'b, 'id>), option<'b>)

split(x, m) returns a triple (l, data, r), where l is the map with all the bindings of m whose key is strictly less than x; r is the map with all the bindings of m whose key is strictly greater than x; data is None if m contains no binding for x, or Some(v) if m binds v to x.

mapU

RESCRIPT

let mapU: (t<'k, 'a, 'id>, 'a => 'b) => t<'k, 'b, 'id>

map

RESCRIPT

let map: (t<'k, 'a, 'id>, 'a => 'b) => t<'k, 'b, 'id>

map(m, f) returns a map with same domain as m, where the associated value a of all bindings of m has been replaced by the result of the application of f to a. The bindings are passed to f in increasing order with respect to the ordering over the type of the keys.

mapWithKeyU

RESCRIPT

let mapWithKeyU: (t<'k, 'a, 'id>, ('k, 'a) => 'b) => t<'k, 'b, 'id>

mapWithKey

RESCRIPT

let mapWithKey: (t<'k, 'a, 'id>, ('k, 'a) => 'b) => t<'k, 'b, 'id>