gnezim
38 lines
959 B
JavaScript
38 lines
959 B
JavaScript
import { isObject, hasOwnProperty } from './utils.js';
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const getLargerArray = (l, r) => l.length > r.length ? l : r;
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const preserve = (diff, left, right) => {
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if (!isObject(diff)) return diff;
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return Object.keys(diff).reduce((acc, key) => {
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const leftArray = left[key];
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const rightArray = right[key];
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if (Array.isArray(leftArray) && Array.isArray(rightArray)) {
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const array = [...getLargerArray(leftArray, rightArray)];
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return {
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...acc,
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[key]: array.reduce((acc2, item, index) => {
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if (hasOwnProperty(diff[key], index)) {
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acc2[index] = preserve(diff[key][index], leftArray[index], rightArray[index]); // diff recurse and check for nested arrays
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return acc2;
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}
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delete acc2[index]; // no diff aka empty
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return acc2;
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}, array)
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};
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}
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return {
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...acc,
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[key]: diff[key]
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};
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}, {});
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};
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export default preserve;
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