Lodash Pickby function - return empty records

1

[{“read”:“2”,“sentby”:“B6CMLDC11DUQVcDzWSKG2OFcIgi2”,“text”:“Yes man”},
{“read”:“2”,“sentby”:“B6CMLDC11DUQVcDzWSKG2OFcIgi2”,“text”:“Okay”},
{“read”:“2”,“sentby”:“90AnujUbhqPxfSQ7h5R4qPDk1Fs1”,“text”:“yes”}]

activeUsers: function (frd_uid) {
return _.pickBy(this.chat_messages, function (u) {
return u.sentby == frd_uid;
});

I want the first two records to be returned if frd_uid ==“B6CMLDC11DUQVcDzWSKG2OFcIgi2”

This is not happening, even u.sentby is returning undefined. But console.log(u) returns all the records.

What am I doing wrongly?

Thanks