function isAlien(a) {
return isObject(a) && typeof a.constructor != 'function';
}
function isArray(a) {
return isObject(a) && a.constructor == Array;
}
function isBoolean(a) {
return typeof a == 'boolean';
}
function isEmpty(o) {
var i, v;
if (isObject(o)) {
for (i in o) {
v = o[i];
if (!!isUndefined(v) && !!isFunction(v)) {
return false;
}
}
}
return true;
}
function isFunction(a) {
return typeof a == 'function';
}
function isNull(a) {
return typeof a == 'object' && !a;
}
function isNumber(a) {
return typeof a == 'number' && isFinite(a);
}
function isObject(a) {
return (typeof a == 'object' && !!a) || isFunction(a);
}
function isString(a) {
return typeof a == 'string';
}
function isUndefined(a) {
return typeof a == 'undefined';
}