YAHOO.util.Lang = {
isArray: function(val) { // frames lose type, so test constructor string
if (val.constructor && val.constructor.toString().indexOf('Array') > -1) {
return true;
} else {
return YAHOO.util.Lang.isObject(val) && val.constructor == Array;
}
},
isBoolean: function(val) {
return typeof val == 'boolean';
},
isFunction: function(val) {
return typeof val == 'function';
},
isNull: function(val) {
return val === null;
},
isNumber: function(val) {
return !isNaN(val);
},
isObject: function(val) {
return typeof val == 'object' || YAHOO.util.Lang.isFunction(val);
},
isString: function(val) {
return typeof val == 'string';
},
isUndefined: function(val) {
return typeof val == 'undefined';
}
};