Better applyDeltas
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This commit is contained in:
2025-08-01 23:33:10 -04:00
parent 2064880673
commit 5bb5067abc
2 changed files with 20 additions and 14 deletions

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@ -1,6 +1,6 @@
{
"name": "@ztimson/utils",
"version": "0.27.1",
"version": "0.27.2",
"description": "Utility library",
"author": "Zak Timson",
"license": "MIT",

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@ -1,22 +1,28 @@
export type Delta = { [key: string]: any | Delta | null };
/**
* Applies deltas in order to modify `target`.
* @param base - Original
* @param deltas - List of deltas to apply
* Applies deltas to `target`.
* @param base starting point
* @param deltas List of deltas to apply
* @returns Mutated target
*/
export function applyDelta(base: any, deltas: any): any {
if(deltas === null) return null;
if(typeof base !== 'object' || base === null) return deltas === undefined ? base : deltas;
const result = Array.isArray(base) ? [...base] : { ...base };
for(const key in deltas) {
const val = deltas[key];
if (val === undefined) delete result[key];
else if (typeof val === 'object' && val !== null && !(Array.isArray(val))) result[key] = applyDelta(result[key], val);
else result[key] = val;
export function applyDeltas(base: any, ...deltas: any): any {
function applyDelta(base: any, delta: any): any {
if(delta === null) return null;
if(typeof base !== 'object' || base === null) return delta === undefined ? base : delta;
const result = Array.isArray(base) ? [...base] : { ...base };
for(const key in delta) {
const val = delta[key];
if (val === undefined) delete result[key];
else if (typeof val === 'object' && val !== null && !(Array.isArray(val))) result[key] = applyDelta(result[key], val);
else result[key] = val;
}
return result;
}
return result;
for(let d of deltas) base = applyDeltas(base, d);
return base;
}
/**