exports.lambdahandler = function(event, context, callback) {   //code goes here}

callback(error, result);

callback();                // It will return success, but no indication to the caller
callback(null);            // It will return success, but no indication to the caller
callback(null, "success"); // It will return the success indication to the caller callback(error); // It will return the error indication to the caller

exports.handler = function(event, context, callback) {
   let arrItems = [4,5,6,8,9,10,35,70,80,31];
   function countevennumbers (items) {
      return new Promise(resolve => {
         setTimeout(() => {
            let a = 0;
            for (var i in items) {
               if (items[i] % 2 == 0) {
                  a++;
               }
            }
            resolve(a);
         },2000);
      });
   }
   let evennumber = countevennumbers(arrItems);
   callback(null,"even numbers equals ="+evennumber);
};

exports.handler = async function(event, context, callback) {
   let arrItems = [4,5,6,8,9,10,35,70,80,31];
   function countevennumbers (items) {
      return new Promise(resolve => {
         setTimeout(() => {
            let a = 0;
            for (var i in items) {
               if (items[i] % 2 == 0) {
                  a++;
               }
            }
            resolve(a);
         }, 2000);
      });
   }
   let evennumber = await countevennumbers(arrItems);
   callback(null,"even numbers equals ="+evennumber);
};

exports.handler = (event, context, callback) => {
   // TOdo implement
   console.log("Remaining time =>", context.getRemainingTimeInMillis());
   console.log("functionName =>", context.functionName);
   console.log("AWSrequestID =>", context.awsRequestId);
   console.log("logGroupName =>", context.log_group_name);
   console.log("logStreamName =>", context.log_stream_name);
   console.log("clientContext =>", context.clientContext);
   callback(null, "Name of aws Lambda is=>"+context.functionName);
};

exports.handler = (event, context, callback) => {
   // TOdo implement
   console.log("Logging for AWS Lamnda in NodeJS");
   callback(null, "Name of aws Lambda is=>"+context.functionName);
};

exports.handler = function(event, context, callback) {
   // this Source code only throws error.
   var error = new Error("something is wrong");
   callback(error);  
};

{
   "errorMessage": "something is wrong", "errorType": "Error", "stackTrace": [ "exports.handler (/var/task/index.js:2:17)" ] }

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