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20 lines
879 B
JavaScript
20 lines
879 B
JavaScript
import { isPlainObject, mapValues, isEmpty, omitBy } from 'lodash';
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export function hashDifferenceDeep(A, B) {
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// If the elements have exactly the same content, the difference is an empty object.
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// This could fail if the objects are both hashes with different permutation of keys,
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// but this case we handle below by digging in recursively.
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if (JSON.stringify(A) === JSON.stringify(B)) return {};
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// Otherwise, if either element is not a hash, always return the first element
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// unchanged as this function only takes difference of hash objects.
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if (!isPlainObject(A) || !isPlainObject(B)) return A;
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// If both elements are hashes, recursively take the difference by all keys
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const rawDiff = mapValues(A, (value, key) => hashDifferenceDeep(value, B[key]));
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// ... and filter out all the empty values.
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return omitBy(rawDiff, value => isEmpty(value));
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}
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