29 lines
848 B
JavaScript
29 lines
848 B
JavaScript
|
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;
|