feat: Map support constructor initialization with MapInitialEntries #2941
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- Added new type alias `MapInitialEntries<K, V>` = { key: K, value: V }[]
- Map constructor now accepts:
• An array of { key, value } objects
• Any array typed as MapInitialEntries<K,V>
- This allows populating a Map in one step with strong typing.
- Example:
let myMap = new Map<string, i32>([
{ key: "a", value: 1 },
{ key: "b", value: 2 },
]);
let init: MapInitialEntries<string, i32> = [
{ key: "x", value: 10 },
{ key: "y", value: 20 },
];
let anotherMap = new Map<string, i32>(init);
std/assembly/map.ts
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| if(entriesLength > 0) { | ||
| if(entriesLength >= this.entriesCapacity) this.bucketsMask = entriesLength; | ||
| this.rehash((this.bucketsMask << 1) | 1); | ||
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| for(let i = 0; i < entriesLength; i++){ |
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| if(entriesLength > 0) { | |
| if(entriesLength >= this.entriesCapacity) this.bucketsMask = entriesLength; | |
| this.rehash((this.bucketsMask << 1) | 1); | |
| for(let i = 0; i < entriesLength; i++){ | |
| if (entriesLength > 0) { | |
| if (entriesLength >= this.entriesCapacity) this.bucketsMask = entriesLength; | |
| this.rehash((this.bucketsMask << 1) | 1); | |
| for (let i = 0; i < entriesLength; i++) { |
pebrianz
changed the title
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the test rt/flags failed to compile, when pass type v128 to the map. it need simd to be enabled. Do you have any suggestion? |
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For update all fixtures, try to run |
CountBleck
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CountBleck
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This seems acceptable, since we don't have tuples or iterables/iterators. (If/when we do add support for tuples, we would replace this mechanism as a breaking change.) I don't know if we should be concerned about the size increase in symbol.release.wat.
See additional comments below.
std/assembly/map.ts
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| constructor() { | ||
| /* nop */ | ||
| constructor(initialEntries: MapInitialEntries<K,V> = []) { |
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This should be nullable, and the default argument should be null instead of []. Tip: if you wrap the entire constructor body with if (initialEntries) {, you can avoid doing initialEntries!.
(I wonder if this change could be beneficial for code that never uses this feature, by making it easier for Binaryen to optimize)
std/assembly/map.ts
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| private entriesCount: i32 = 0; | ||
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| constructor(initialEntries: MapInitialEntries<K,V> = []) { | ||
| let entriesLength = initialEntries.length; |
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plz revert this cached entriesLength var and use instead initialEntries.length
std/assembly/map.ts
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| if (initialEntries.length >= this.entriesCapacity) this.bucketsMask = initialEntries.length; | ||
| this.rehash((this.bucketsMask << 1) | 1); | ||
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| for (let i = 0; i < initialEntries.length; i++) { |
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plz cache initialEntries.length into var
std/assembly/map.ts
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| constructor() { | ||
| /* nop */ | ||
| constructor(initialEntries: MapInitialEntries<K,V> | null = null) { | ||
| if (initialEntries) { |
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Just use early return:
| if (initialEntries) { | |
| if (!initialEntries || !initialEntries.length) return; |
This will reduce one level of ident
…nd use cache initialEntries length
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This PR has been automatically marked as stale because it has not had recent activity. It will be closed in one week if no further activity occurs. Thank you for your contributions! |
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This PR has been automatically closed due to lack of recent activity, but feel free to reopen it as long as you merge in the main branch afterwards. |
3 participants
MapInitialEntries<K, V>= { key: K, value: V }[]• An array of { key, value } objects
• Any array typed as MapInitialEntries<K,V>
Fixes #2940