Checking empty object, empty string, undefined by jQuery

empty.js

// function for check empty by data type
var is_empty = function(data) {
    // data type object
    if (typeof(data) === 'object') {
        // check empty for data object
        if (JSON.stringify(data) === '{}' || JSON.stringify(data) === '[]'){
            return true;
        } else if(!data) {
            return true;
        }
        return false;
    // data type string
    } else if (typeof(data) === 'string') {
        // check empty for data string
        if (!data.trim() || data == "" || data == null){
            return true;
        }
        return false;
    // data type undefined
    } else if (typeof(data) === 'undefined'){
        return true;
    } else {
        return false;
    }
}