gnezim
54 lines
1.6 KiB
JavaScript
54 lines
1.6 KiB
JavaScript
import { isDate, isEmpty, isObject, hasOwnProperty } from './utils.js';
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const diff = (lhs, rhs) => {
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if (lhs === rhs) return {}; // equal return no diff
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if (!isObject(lhs) || !isObject(rhs)) return rhs; // return updated rhs
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const l = lhs;
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const r = rhs;
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const deletedValues = Object.keys(l).reduce((acc, key) => {
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return hasOwnProperty(r, key) ? acc : { ...acc, [key]: undefined };
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}, {});
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if (isDate(l) || isDate(r)) {
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if (l.valueOf() == r.valueOf()) return {};
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return r;
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}
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if (Array.isArray(r) && Array.isArray(l)) {
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const deletedValues = l.reduce((acc, item, index) => {
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return hasOwnProperty(r, index) ? acc.concat(item) : acc.concat(undefined);
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}, []);
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return r.reduce((acc, rightItem, index) => {
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if (!hasOwnProperty(deletedValues, index)) {
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return acc.concat(rightItem);
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}
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const leftItem = l[index];
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const difference = diff(rightItem, leftItem);
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if (isObject(difference) && isEmpty(difference) && !isDate(difference)) {
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delete acc[index];
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return acc; // return no diff
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}
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return acc.slice(0, index).concat(rightItem).concat(acc.slice(index + 1)); // return updated key
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}, deletedValues);
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}
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return Object.keys(r).reduce((acc, key) => {
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if (!hasOwnProperty(l, key)) return { ...acc, [key]: r[key] }; // return added r key
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const difference = diff(l[key], r[key]);
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if (isObject(difference) && isEmpty(difference) && !isDate(difference)) return acc; // return no diff
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return { ...acc, [key]: difference }; // return updated key
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}, deletedValues);
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};
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export default diff;
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