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perf(to-hierarchy): optimize to use single-pass approach

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This commit is contained in:
Eric Liu 2025-04-12 15:45:08 -07:00
commit dd41c977ed
1 changed files with 11 additions and 24 deletions
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35
src/utils/toHierarchy.js
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@ -13,35 +13,22 @@
export function toHierarchy(flatArray, getParentId) {
/** @type {NodeLike[]} */
const tree = [];
const childrenOf = new Map();
const itemsMap = new Map(flatArray.map((item) => [item.id, item]));
const nodeMap = new Map();
flatArray.forEach((item) => {
for (const item of flatArray) {
const parentId = getParentId(item);
nodeMap.set(item.id, item);
// Only create nodes array if we have children.
const children = childrenOf.get(item.id);
if (children) {
item.nodes = children;
}
// Check if parentId exists using Map instead of array lookup.
const parentExists = parentId && itemsMap.has(parentId);
if (parentId && parentExists) {
if (!childrenOf.has(parentId)) {
childrenOf.set(parentId, []);
}
childrenOf.get(parentId).push(item);
const parent = itemsMap.get(parentId);
if (parent) {
parent.nodes = childrenOf.get(parentId);
}
} else {
if (!parentId || !nodeMap.has(parentId)) {
tree.push(item);
} else {
const parent = nodeMap.get(parentId);
if (!parent.nodes) {
parent.nodes = [];
}
parent.nodes.push(item);
}
}
});
return tree;
}