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Draft empty unwrapping #1909

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Draft empty unwrapping #1909

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2 changes: 2 additions & 0 deletions src/List.js
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Expand Up @@ -257,6 +257,8 @@ ListPrototype['@@transducer/result'] = function (obj) {
return obj.asImmutable();
};

ListPrototype.__empty = emptyList;

class VNode {
constructor(array, ownerID) {
this.array = array;
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2 changes: 2 additions & 0 deletions src/Map.js
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Expand Up @@ -185,6 +185,8 @@ MapPrototype['@@transducer/result'] = function (obj) {
return obj.asImmutable();
};

MapPrototype.__empty = emptyMap;

// #pragma Trie Nodes

class ArrayMapNode {
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7 changes: 5 additions & 2 deletions src/OrderedMap.js
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Expand Up @@ -93,8 +93,11 @@ export class OrderedMap extends Map {

OrderedMap.isOrderedMap = isOrderedMap;

OrderedMap.prototype[IS_ORDERED_SYMBOL] = true;
OrderedMap.prototype[DELETE] = OrderedMap.prototype.remove;
const OrderedMapPrototype = OrderedMap.prototype;
OrderedMapPrototype[IS_ORDERED_SYMBOL] = true;
OrderedMapPrototype[DELETE] = OrderedMapPrototype.remove;

OrderedMapPrototype.__empty = emptyOrderedMap;

function makeOrderedMap(map, list, ownerID, hash) {
const omap = Object.create(OrderedMap.prototype);
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30 changes: 16 additions & 14 deletions src/Stack.js
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Expand Up @@ -192,6 +192,21 @@ export class Stack extends IndexedCollection {
}
}

function makeStack(size, head, ownerID, hash) {
const map = Object.create(StackPrototype);
map.size = size;
map._head = head;
map.__ownerID = ownerID;
map.__hash = hash;
map.__altered = false;
return map;
}

let EMPTY_STACK;
function emptyStack() {
return EMPTY_STACK || (EMPTY_STACK = makeStack(0));
}

Stack.isStack = isStack;

const StackPrototype = Stack.prototype;
Expand All @@ -210,17 +225,4 @@ StackPrototype['@@transducer/result'] = function (obj) {
return obj.asImmutable();
};

function makeStack(size, head, ownerID, hash) {
const map = Object.create(StackPrototype);
map.size = size;
map._head = head;
map.__ownerID = ownerID;
map.__hash = hash;
map.__altered = false;
return map;
}

let EMPTY_STACK;
function emptyStack() {
return EMPTY_STACK || (EMPTY_STACK = makeStack(0));
}
StackPrototype.__empty = emptyStack;