var obj = {

  typeOf: function(obj) {

    const toString = Object.prototype.toString;

    const map = {

      '[object Boolean]': 'boolean',

      '[object Number]': 'number',

      '[object String]': 'string',

      '[object Function]': 'function',

      '[object Array]': 'array',

      '[object Date]': 'date',

      '[object RegExp]': 'regExp',

      '[object Undefined]': 'undefined',

      '[object Null]': 'null',

      '[object Object]': 'object'

    };

    return map[toString.call(obj)];

  },

  deepCopy(data) {

    const t = this.typeOf(data);

    let o,

      i;

    if (t === 'array') {

      o = [];

    } else if (t === 'object') {

      o = {};

    } else {

      return data;

    }

    if (t === 'array') {

      for (let i = 0; i < data.length; i++) {

        o.push(this.deepCopy(data[i]));

      }

    } else if (t === 'object') {

      for (i in data) {

        o[i] = this.deepCopy(data[i]);

      }

    }

    return o;

  }

};