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website/docs/OrderedMap.mdx
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Julien Deniau
Typo in OrderedMap
02 окт 2025, 11:09
02 окт 2025, 11:09
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import Repl from '@/repl/Repl.tsx'; import CodeLink from '@/mdx-components/CodeLink.tsx'; # OrderedMap A type of [`Map`](../Map/) that maintains the order of iteration according to when entries were set. <Signature code={`type OrderedMap<K, V> extends Map<K, V>`} /> The iteration behavior of OrderedMap is the same as native ES6 Map and JavaScript Object. Note that `OrderedMap` are more expensive than non-ordered Map and may consume more memory. OrderedMap#set is amortized `O(log32 N)`, but not stable. Let's look at the following example to see the difference between `Map` and `OrderedMap`: <Repl defaultValue={`Map({a: 1, c: 3, b: 2})`} /> The `b` key is re-located on the second position. <Repl defaultValue={`OrderedMap({a: 1, c: 3, b: 2})`} /> The `b` key is still on the third position. ## Similar API with `Map` `OrderedMap` has the exact same API as [`Map`](../Map/). The only new method is <CodeLink to="isOrderedMap">OrderedMap.isOrderedMap(maybeOrderedMap)</CodeLink> to check if a value is an `OrderedMap`. ## Construction <MemberLabel label="OrderedMap()" /> Creates a new Immutable OrderedMap. <Signature code={`OrderedMap<K, V>(collection?: Iterable<[K, V]>): OrderedMap<K, V> OrderedMap<V>(obj: { [key: PropertyKey]: V }): OrderedMap<PropertyKey, V>`} /> Note: `OrderedMap` is a factory function and not a class, and does not use the `new` keyword during construction. <Repl defaultValue={`OrderedMap({ a: 1, b: 2 })`} /> ## Static Methods <MemberLabel label="OrderedMap.isOrderedMap()" /> True if the provided value is an OrderedMap. <Signature code={`OrderedMap.isOrderedMap(maybeOrderedMap): boolean`} />