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In this video, we are going to develop hands on labs, which is the greetings solution.

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You can see the image on the slide.

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We basically create an idea with Islam the function and develop a greeting function.

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This function will be invoked from us, which using the seal commands and we are placing the event JSON

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object and invoke these functions synchronously.

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And this goes back to greeting message to the user.

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And we have four main steps that following this project we will develop creating function, zip this

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function and create this function with a lambda.

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And after that we will invoke this function with commands sensitive and JSON file.

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Let's get started.

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In order to do that, please open the Visual Studio code and go to the Lecture 62, which is the Hands

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On Greeting Project, and we will follow these steps step by step.

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The first step is developing lambda function.

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To do that, I'm going to go to the index JS file and I will start coding developing our lambda function.

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You can see that this is the similar and basic structure of the lambda function and get event parameter

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as a parameter of this lambda function.

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Okay, let's start our example and we are going to develop greeting project.

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So that's why let's write the code.

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Now I'm going to parse incoming input, parse the input values.

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Think about that.

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This is triggering from the Avengers subject.

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So first of all, I would like to pass the input values.

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And after that, I'm going to generate.

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Greeting message.

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And after that log and return back message.

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So these are the three main steps that I'm going to develop one by one.

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So let's start one by one.

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First of all, we should start with the parsing, the input values, but before that, we should understand

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the incoming event.

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Basically, we are expecting the incoming event, which include name, city time and the day.

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So before this function, I would like to create some arrays that we can get these day and time information

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for that purpose.

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I'm defining this array.

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And in this array, we we will have weekdays, which is the Monday.

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They?

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And.

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Other days of the week, we have a days array that we can select one of them, one according to incoming

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events.

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And after that is the same way we have day times, for example morning, afternoon, evening, night

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and day.

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So that's why I have created two array at the beginning of the index case file.

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And after that we will use these days and times in the 100 method when parsing the input values.

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So input values I expect the name information.

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So that's why I'm defining a name and I expect that the name information should come from the event

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name.

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And we can also check.

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Is that any name or not?

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With the control?

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Undefined or not, if there is undefined, we can say that write down the you only.

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If there is no a problem we can get the event name.

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So it's the same code practices.

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I will follow the city.

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And I'm expecting name on the city information and if there is undefined we can use these pre-defined

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words in order to avoid any exception is the same way.

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I'm going to continue with the other parameters, which is the time and the day.

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So for example, let's create.

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Time equal even that.

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Time.

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But if there is an undefined, we should check the times array and we are waiting times in these array

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text.

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So if there is not an array, we should perform the default values.

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In order to do that, I'm going to modify this line of code according to checking the index of method.

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So basically in the incoming event, time should be include our times array.

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If not include.

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We should set the day as a default.

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Otherwise we should set these event time information at the same way I'm going to get the date information.

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We have a date array and we are expecting to days into our days array.

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Otherwise we set the null operation.

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Okay.

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We have finished the pass the input values from the incoming event JSON object and now we have this

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LED name, city time and date parameters that we can create and generate greeting message.

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Now we are going to perform from our main logic, which is the generate greeting message for that purpose

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I'm going to create.

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We were able, which is a great thing, and we can start good.

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And time you can think that a good morning and let me continue with the.

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Name.

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Good morning name.

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And we can give some other information like city.

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And we can also say that.

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AP the information.

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They means we are expecting that.

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Happy Tuesday, Wednesday and so on.

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Okay.

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So very good.

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We are finishing our greeting message.

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You can think that this is the business logic of the lambda function and we paraphrased some message

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according to incoming event JSON object.

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And after that I'm going to log these message, see what happens from the last management cloud, which

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looks console that look and we can say that message.

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A cool one good thing.

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Now return back to the greeting message to the lambda function.

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Okay.

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Basically, we expect an event that triggers to lambda function and includes the name set time and day

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information.

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And after parsing these these attributes, we are going to generate a greeting message and return back

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to this greeting message with logging to Amazon Cloud.

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With these attributes, we will do our business logic and create a greeting message and return back

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the greeting message as per the incoming event parameters.

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So now we have developed our function and if you go to the command section, we have finished the first

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part and continue with the second part.

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The second part is the same.

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We are following the zip file.

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I'm going to use compress archive.

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Since we have one index case, I'm going to run this command and create a function zip.

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I'm sorry.

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Let me locate the correct lecture.

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Okay.

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Now run this command again and create functions under the correct folder structure.

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Okay.

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The second step is also done.

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Now we are going to create lambda function with using CLI.

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As you remember that the important thing is we should get the wrong name, which is the lambda execution

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role and you should get the error of this role when creating a function.

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So after getting these, Aaron, you should run this command, which is the create function command.

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You can copy and paste from here and please make sure that your multi-line character is correct windows

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using this character and the Mac users using this multi-line character.

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Okay, now we are going to create a function which is the greeting function we have developed in index

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JS and we zip it the function zip and we are using our existing execution role, which is the Lambda

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X hit the enter and this will be create our creating function very good.

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So in the last step we are going to create event JSON file and after that we will invoke this function.

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So let's create our imagination file.

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If you scroll down, we can see that we should create these JSON file and these include name set time

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and the information we can follow.

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These variables in here is you can set time and they are array in our code.

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So that's why I'm giving these parameters from the array values morning and Wednesday.

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Okay.

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After created this event JSON object, now we can invoke our function.

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So in order to do that, if you scroll down you can see the invocation self commands.

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We use a lambda invoke command passing the function name.

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See that we have created the function name as a greeting.

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So that's why make sure that your function name should be the correct which we have created.

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So that's what I'm going to copy designer code and paste in here and hit enter and see the invocation.

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Okay.

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As you can see, that response is 200 success and we will check the response JSON object.

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Now, if you open the response that JSON object, you can see that we have generated a greeting message

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which is the good morning of Istanbul, happy Wednesday.

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So we have successfully create, develop and test our lambda functions and let's all leave and verify

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from the management console.

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Let me open the message console.

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Go to lambda functions.

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And if you scroll down you can see that greeting function is created successfully.

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If you open this created greeting function and scroll down, you can see that our code is comes in here,

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in here deploying successfully.

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We have an arrays and we are logging incoming message.

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We are passing input values, we are generating greeting message and logging greeting message and return

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back to greeting message.

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So if you go up and go to monitor and we watch logs.

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We have an invocation for testing this function, which commands if you open the latest log stream,

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you can see that this is the our incoming message of this lambda function.

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And if you look at the other logging message, you can see that this is the logging or greeting message

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which is a good morning Mamata Istanbul happy birthday and return back this message to the client application.

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So as you can see that we have passed this event object and read from the lambda function check from

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the lambda execution, Amazon Cloud Watch logs and now it is time to delete our function.

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It is important step before proceeding we should delete our functions.

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If you go to the lambda section again and go to the functions, I'm going to select all functions and

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come to actions and click the delete and write down delete.

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It to the right information and close.

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Make sure that your function is data successfully.

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And as you can see that we have verified that we are creating a greeting project with hands on loop,

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developing creative function and sensory evaluation.

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Invoke the synchronously and get back to response successfully with using the commands.