Determine if the Salesforce instance is production org or a Sandbox org in code?

Most efficient way of identifying the type of org (Production or Sandbox) via Apex code:

Actually we can query this detail from Organization object as below:

SELECT IsSandbox, InstanceName FROM Organization LIMIT 1

On the top of this, we can build our own service method like below:

public static Boolean isSandbox(){
    return [SELECT IsSandbox, InstanceName FROM Organization LIMIT 1].IsSandbox;
}