17 lines
316 B
JavaScript
17 lines
316 B
JavaScript
'use strict';
|
|
|
|
module.exports = {
|
|
isString: function (arg) {
|
|
return typeof arg === 'string';
|
|
},
|
|
isObject: function (arg) {
|
|
return typeof arg === 'object' && arg !== null;
|
|
},
|
|
isNull: function (arg) {
|
|
return arg === null;
|
|
},
|
|
isNullOrUndefined: function (arg) {
|
|
return arg == null;
|
|
}
|
|
};
|