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var isArray = require('../lang/isArray'),
toObject = require('./toObject');
/** Used to match property names within property paths. */
var reIsDeepProp = /\.|\[(?:[^[\]]*|(["'])(?:(?!\1)[^\n\\]|\\.)*?\1)\]/,
reIsPlainProp = /^\w*$/;
/**
* Checks if `value` is a property name and not a property path.
*
* @private
* @param {*} value The value to check.
* @param {Object} [object] The object to query keys on.
* @returns {boolean} Returns `true` if `value` is a property name, else `false`.
*/
function isKey(value, object) {
var type = typeof value;
if ((type == 'string' && reIsPlainProp.test(value)) || type == 'number') {
return true;
}
if (isArray(value)) {
return false;
}
var result = !reIsDeepProp.test(value);
return result || (object != null && value in toObject(object));
}
module.exports = isKey;
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