AWS Lambda best practices

The AWS Lambda best practices are as follows:

• It is best practice to write an AWS Lambda function in a stateless style. It should not have any affinity with the underlying compute infrastructure.
• A persistent state should be stored in another cloud service, such as Amazon S3 or DynamoDB.
• It is recommended to separate core logic from the Lambda handler, as the handler is generally used as an entry point to the function.
• When a Lambda function is deployed over a VPC, it is a best practice to avoid DNS resolution for a public hostname, as it may take several seconds to resolve adding several billable seconds.
• It is recommended to specify at least one subnet in each AZ with the Lambda function configuration.
• It is recommended to make sure sufficient subnet IPs are free to allow Lambda functions to scale. If there aren't any free subnet IPs, Lambda functions will not scale and Lambda function failure will increase.
• Rather than re-initializating variables or objects on every...