69 lines
1.5 KiB
JavaScript
69 lines
1.5 KiB
JavaScript
'use strict';
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const isObject = value => typeof value === 'object' && value !== null;
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const mapObjectSkip = Symbol('skip');
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// Customized for this use-case
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const isObjectCustom = value =>
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isObject(value) &&
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!(value instanceof RegExp) &&
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!(value instanceof Error) &&
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!(value instanceof Date);
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const mapObject = (object, mapper, options, isSeen = new WeakMap()) => {
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options = {
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deep: false,
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target: {},
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...options
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};
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if (isSeen.has(object)) {
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return isSeen.get(object);
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}
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isSeen.set(object, options.target);
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const {target} = options;
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delete options.target;
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const mapArray = array => array.map(element => isObjectCustom(element) ? mapObject(element, mapper, options, isSeen) : element);
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if (Array.isArray(object)) {
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return mapArray(object);
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}
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for (const [key, value] of Object.entries(object)) {
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const mapResult = mapper(key, value, object);
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if (mapResult === mapObjectSkip) {
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continue;
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}
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let [newKey, newValue, {shouldRecurse = true} = {}] = mapResult;
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// Drop `__proto__` keys.
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if (newKey === '__proto__') {
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continue;
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}
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if (options.deep && shouldRecurse && isObjectCustom(newValue)) {
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newValue = Array.isArray(newValue) ?
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mapArray(newValue) :
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mapObject(newValue, mapper, options, isSeen);
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}
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target[newKey] = newValue;
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}
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return target;
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};
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module.exports = (object, mapper, options) => {
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if (!isObject(object)) {
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throw new TypeError(`Expected an object, got \`${object}\` (${typeof object})`);
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}
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return mapObject(object, mapper, options);
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};
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module.exports.mapObjectSkip = mapObjectSkip;
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