65 lines
1.5 KiB
JavaScript
65 lines
1.5 KiB
JavaScript
import reduce from 'lodash/collection/reduce';
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import isEmpty from 'lodash/lang/isEmpty';
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import assign from 'lodash/object/assign';
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function resolveUpdates(updates, obj = {}) {
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return reduce(updates, (acc, value, key) => {
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let updatedValue = value;
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if (!Array.isArray(value) && value !== null && typeof value === 'object') {
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updatedValue = update(value, obj[key]);
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} else if (typeof value === 'function') {
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updatedValue = value(obj[key]);
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}
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if (obj[key] !== updatedValue) {
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acc[key] = updatedValue;
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}
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return acc;
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}, {});
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}
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function updateArray(updates, obj) {
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const newObj = [...obj];
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return reduce(updates, (acc, value, index) => {
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acc[index] = value;
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return acc;
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}, newObj);
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}
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/**
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* Recursively update an object or array.
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*
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* Can update with values:
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* update({ foo: 3 }, { foo: 1, bar: 2 });
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* // => { foo: 3, bar: 2 }
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*
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* Or with a function:
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* update({ foo: x => (x + 1) }, { foo: 2 });
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* // => { foo: 3 }
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*
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* @param {Object|Function} updates
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* @param {Object|Array} object to update
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* @return {Object|Array} new object with modifications
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*/
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function update(updates, obj) {
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if (typeof updates === 'function') {
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return updates(obj);
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}
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const resolvedUpdates = resolveUpdates(updates, obj);
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if (isEmpty(resolvedUpdates)) {
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return obj;
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}
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if (Array.isArray(obj)) {
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return updateArray(resolvedUpdates, obj);
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}
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return assign({}, obj, resolvedUpdates);
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}
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export default update;
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