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38 lines
1.3 KiB
38 lines
1.3 KiB
4 years ago
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'use strict';
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var InternalStateModule = require('../internals/internal-state');
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var createIteratorConstructor = require('../internals/create-iterator-constructor');
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var has = require('../internals/has');
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var objectKeys = require('../internals/object-keys');
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var toObject = require('../internals/to-object');
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var OBJECT_ITERATOR = 'Object Iterator';
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var setInternalState = InternalStateModule.set;
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var getInternalState = InternalStateModule.getterFor(OBJECT_ITERATOR);
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module.exports = createIteratorConstructor(function ObjectIterator(source, mode) {
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var object = toObject(source);
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setInternalState(this, {
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type: OBJECT_ITERATOR,
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mode: mode,
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object: object,
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keys: objectKeys(object),
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index: 0
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});
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}, 'Object', function next() {
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var state = getInternalState(this);
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var keys = state.keys;
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while (true) {
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if (keys === null || state.index >= keys.length) {
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state.object = state.keys = null;
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return { value: undefined, done: true };
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}
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var key = keys[state.index++];
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var object = state.object;
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if (!has(object, key)) continue;
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switch (state.mode) {
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case 'keys': return { value: key, done: false };
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case 'values': return { value: object[key], done: false };
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} /* entries */ return { value: [key, object[key]], done: false };
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}
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});
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