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43 lines
1.4 KiB
43 lines
1.4 KiB
var _setup = require('./_setup.js');
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var isFunction = require('./isFunction.js');
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var _has = require('./_has.js');
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// Internal helper to create a simple lookup structure.
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// `collectNonEnumProps` used to depend on `_.contains`, but this led to
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// circular imports. `emulatedSet` is a one-off solution that only works for
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// arrays of strings.
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function emulatedSet(keys) {
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var hash = {};
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for (var l = keys.length, i = 0; i < l; ++i) hash[keys[i]] = true;
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return {
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contains: function(key) { return hash[key] === true; },
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push: function(key) {
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hash[key] = true;
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return keys.push(key);
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}
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};
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}
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// Internal helper. Checks `keys` for the presence of keys in IE < 9 that won't
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// be iterated by `for key in ...` and thus missed. Extends `keys` in place if
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// needed.
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function collectNonEnumProps(obj, keys) {
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keys = emulatedSet(keys);
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var nonEnumIdx = _setup.nonEnumerableProps.length;
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var constructor = obj.constructor;
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var proto = (isFunction(constructor) && constructor.prototype) || _setup.ObjProto;
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// Constructor is a special case.
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var prop = 'constructor';
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if (_has(obj, prop) && !keys.contains(prop)) keys.push(prop);
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while (nonEnumIdx--) {
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prop = _setup.nonEnumerableProps[nonEnumIdx];
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if (prop in obj && obj[prop] !== proto[prop] && !keys.contains(prop)) {
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keys.push(prop);
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}
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}
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}
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module.exports = collectNonEnumProps;
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