function pairs(object) {
      object = toObject(object);

      var index = -1,
          props = keys(object),
          length = props.length,
          result = Array(length);

      while (++index < length) {
        var key = props[index];
        result[index] = [key, object[key]];
      }
      return result;
    }
Creates an object composed of the picked `object` properties. Property
names may be specified as individual arguments or as arrays of property
names. If `predicate` is provided it is invoked for each property of `object`
picking the properties `predicate` returns truthy for. The predicate is
bound to `thisArg` and invoked with three arguments: (value, key, object).

@static
@memberOf _
@category Object
@param {Object} object The source object.
@param {Function|...(string|string[])} [predicate] The function invoked per
 iteration or property names to pick, specified as individual property
 names or arrays of property names.
@param {*} [thisArg] The `this` binding of `predicate`.
@returns {Object} Returns the new object.
@example

var object = { 'user': 'fred', 'age': 40 };

_.pick(object, 'user');
// => { 'user': 'fred' }

_.pick(object, _.isString);
// => { 'user': 'fred' }