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Immutable.js

List
Map
OrderedMap
Set
OrderedSet
Stack
Range()
Repeat()
Record
Record.Factory
Seq
Seq.Keyed
Seq.Indexed
Seq.Set
Collection
Collection.Keyed
Collection.Indexed
Collection.Set
ValueObject
OrderedCollection
fromJS()
is()
hash()
isImmutable()
isCollection()
isKeyed()
isIndexed()
isAssociative()
isOrdered()
isValueObject()
isSeq()
isList()
isMap()
isOrderedMap()
isStack()
isSet()
isOrderedSet()
isRecord()
get()
has()
remove()
set()
update()
getIn()
hasIn()
removeIn()
setIn()
updateIn()
merge()
mergeWith()
mergeDeep()
mergeDeepWith()

isValueObject()

True if maybeValue is a JavaScript Object which has both equals() and hashCode() methods.

Method signature

isValueObject(maybeValue: unknown): boolean;

Any two instances of value objects can be compared for value equality with Immutable.is() and can be used as keys in a Map or members in a Set.

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