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