Conventions

In this book, you will find a number of text styles that distinguish between different kinds of information. Here are some examples of these styles and an explanation of their meaning. Code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: "The describe-log-groups command will list all the log groups that are prefixed with /aws/lambda. "

A block of code is set as follows:

exports.myHandler = function(event, context, callback) {
  console.log("value = " + event.key);
  console.log("functionName = ", context.functionName);
  callback(null, "Yippee! Something worked!");
}; 

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

exports.myHandler = (event, context, callback) => { 
  console.log('remaining time =', context.getRemainingTimeInMillis());
  console.log('functionName =', context.functionName);
  console.log('AWSrequestID =', context.awsRequestId);
  console.log('logGroupName =', context.logGroupName);
  console.log('logStreamName =', context.logStreamName);

Any command-line input or output is written as follows:

# aws lambda list-functions 

New terms and important words are shown in bold. Words that you see on the screen, for example, in menus or dialog boxes, appear in the text like this: "In the Review page, select the Create function option."