function getType(data) {
    //получили строку вида "[Object Type]"
    var type = Object.prototype.toString.call(data);
    //оставили только "Type"
    type = type.slice(8, -1);
    //перевели в нижний регистр первый символ
    type = type[0].toLowerCase() + type.slice(1);
    /*
     * здесь используем typeOf, потому что
     * toString.call() возвращает
     * для arguments значение не "object",
     а "arguments"
     */
    if (typeof data == "object" && type != "array" && data.length >= 0) {
        for (var i = 0; i < data.length; i++) {
            if (!data.hasOwnProperty(i.toString())) {
                return "object;"
            }
        }
        type = "array-like";
    }
    return type;
}
 
console.log(getType(13));
console.log(getType("I'm a string"));
console.log(getType([1, 2, 3]));
console.log(getType(true));
console.log(getType(undefined));
console.log(getType(function() {var x = 2 + 2; }));
console.log(getType({foo: 1, bar: 2}));
console.log(getType(null));
 
function getArguments(x, y) {
    return arguments;
}
var args = getArguments(1, 3);
 
console.log(getType(args));
 

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