21 lines
669 B
JavaScript
21 lines
669 B
JavaScript
var _getLength = require('./_getLength.js');
|
|
var isArray = require('./isArray.js');
|
|
var isString = require('./isString.js');
|
|
var isArguments = require('./isArguments.js');
|
|
var keys = require('./keys.js');
|
|
|
|
// Is a given array, string, or object empty?
|
|
// An "empty" object has no enumerable own-properties.
|
|
function isEmpty(obj) {
|
|
if (obj == null) return true;
|
|
// Skip the more expensive `toString`-based type checks if `obj` has no
|
|
// `.length`.
|
|
var length = _getLength(obj);
|
|
if (typeof length == 'number' && (
|
|
isArray(obj) || isString(obj) || isArguments(obj)
|
|
)) return length === 0;
|
|
return _getLength(keys(obj)) === 0;
|
|
}
|
|
|
|
module.exports = isEmpty;
|