Say Hello to AWS Lambda

Lambda

AWS Lambda is a serverless computing platform that allows users to create functions and run your code without provisioning or managing servers. It executes your code only when needed and scales automatically and we need to pay only for the compute time consumed.

For more details : https://docs.aws.amazon.com/lambda/latest/dg/welcome.html

Languages supported

• Java
• Nodejs
• Python
• Ruby
• Go
• Dotnet 

https://docs.aws.amazon.com/lambda/latest/dg/lambda-runtimes.html

Use Case 

Today we are going to write a simple lambda function in nodejs which takes 2 strings as input and check if the first string is a substring of the second string.

{

   "first' : "serverless",

   "second" : "The art of serverless" 

}

We will be receiving below response.

{

"substring" : true 

}

Steps

a) Login to AWS management console

b Search for the service 'Lambda'

c) From the Lambda console click on create a function.
d) Fill in all the mandatory fields

e) Add below code in index.js or the default handler specified.

exports.handler = async (event) => {

    

    var first = event.first;

    var second = event.second;

    var substing = second.includes(first);

    

    const result = {'substring' : substing  };

    

    // TODO implement

    const response = {

        statusCode: 200,

        body: JSON.stringify(result),

    };

    return response;

};

f) To test the function create a test event like below

g) See the response below

I