83 lines
1.9 KiB
JavaScript
83 lines
1.9 KiB
JavaScript
import wrap from './wrap';
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function isEmpty(object) {
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return !Object.keys(object).length;
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}
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function reduce(object, callback, initialValue) {
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return Object.keys(object).reduce((acc, key) => {
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return callback(acc, object[key], key);
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}, initialValue);
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}
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function resolveUpdates(updates, object) {
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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, object[key]);
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} else if (typeof value === 'function') {
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updatedValue = value(object[key]);
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}
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if (object[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, object) {
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const newArray = [...object];
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Object.keys(updates).forEach((key) => {
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newArray[key] = updates[key];
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});
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return newArray;
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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, object, ...args) {
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if (typeof updates === 'function') {
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return updates(object, ...args);
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}
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if (updates === null || typeof updates !== 'object') {
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return updates;
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}
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const defaultedObject = (typeof object === 'undefined' || object === null) ?
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{} :
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object;
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const resolvedUpdates = resolveUpdates(updates, defaultedObject);
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if (isEmpty(resolvedUpdates)) {
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return object;
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}
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if (Array.isArray(defaultedObject)) {
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return updateArray(resolvedUpdates, defaultedObject);
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}
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return { ...defaultedObject, ...resolvedUpdates };
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}
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export default wrap(update, 2);
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