How to use

invoke

function

in

LoDashStatic

// contact
 _addContact(user) {
  if (_.isEmpty(user)) {
   return;
  }

  user.NickName = this._removeEmoji(user.NickName);
  user.RemarkName = this._removeEmoji(user.RemarkName);

  if (this.contacts[user.UserName]) {
   _.invoke(this.contactList, function() {
    // this: each item
    return (this.UserName === user.UserName) ? user : this;
   });
  } else {
   this.contactList.push(user);
  }

  this.contacts[user.UserName] = user;

  // update chat
  if (user.UserName === this.chat.UserName) {
   this._setChat(user);
  }
 }

_.invoke(formsToPurge[submission.form.toString()], Function.call, null, submission);