mizoR

    var targetUsername = 'ccc';
    var jsons = $("#downloaded").val().split("\n");
    jsons = $.map(jsons, function (json, i) {
      json = JSON.parse(json);
      if (json.username === targetUsername) {
        return {"key": json.username, "count": 1, "like": json.like}
      } else {
        return null;
      }
    });

mizoR

➜  ~  irb
irb(main):001:0> class MyClass
irb(main):002:1>   def one
irb(main):003:2>     def two
irb(main):004:3>       'hello'
irb(main):005:3>     end
irb(main):006:2>   end
irb(main):007:1> end
=> nil
irb(main):008:0> MyClass.instance_methods(false).grep /one/