e-lado/node_modules0/es5-ext/object/first-key.js

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'use strict';

var value = require('./valid-value')

  , propertyIsEnumerable = Object.prototype.propertyIsEnumerable;

module.exports = function (obj) {
	var i;
	value(obj);
	for (i in obj) {
		if (propertyIsEnumerable.call(obj, i)) return i;
	}
	return null;
};