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/** Test type of object **/

function is(type, obj) {
    var clas = Object.prototype.toString.call(obj).slice(8, -1);
    return obj !== undefined && obj !== null && clas === type;
}

console.log(is('String', 'test')); // true
console.log(is('String', new String('test'))); // true
console.log(is('Date', new Date())); // true