Trigger to Update the Child record with Parent field data - Using Map(only on insert)

This trigger is to show the use of Map in apex. Here we are updating the contact's type field with the corresponding parent(Account)'s name.

for ex:
       if Account name = 'Prestige';
          Contact name = 'contact 3'
       then the 'Type' field from the contact will get updated with 
          Contact Type - 'Prestige - Contact'

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trigger UpdateContactFieldWithAccountUsingMap on Contact (before insert) { set<id> Accountids = New set<id>(); for(contact con : trigger.new){ Accountids.add(con.AccountId); } map<Id,Account> IdAccountMap = new map<Id, Account>([select id, name from account where id in : Accountids]); for(contact con : trigger.new){ if(con.accountId!=null && IdAccountMap.containskey(con.accountId)){ con.Title = IdAccountMap.get(con.AccountId).name + '- Contact'; } } }