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In this video we are going to learn how to use a lambda environment variables.

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Amongst variables, very important topics that we can use with the lambda functions.

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We can use variables to adjust our functions behavior without updating the code.

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An environment variable is a pair of strings that is stored in a function's version specific configuration.

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So it is lambda runtime makes environment variables available to our code and set additional environment

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variables that contain information about the function and the invocation of the request.

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So we can configure environment variables with using a case management console.

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Let me show from the management console first.

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Go to functions, go to my function three and if you click the configuration, we can set the environment

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variables to set and one with variable.

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Go to lambda console, open the function page, choose the function, choose the configuration and choose

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the environment variables.

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Here you can see the materials under the environment variables, we can choose the edit button and we

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can add the environment variable in here.

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For example, let me add an environment variable.

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The key could be the table name and table name will be the product.

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Okay.

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This will be the ah first environment variable for mind function three.

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Let me save here.

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You can see that we can add environment variable B using the management console and also we can configure

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in one service with Lambda API or a CDK, SLI or SDHC.

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So let me show you one example about a SLI.

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Please open the OR.

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We used to decode and create a Neve folder structure and open the command text file.

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You can see in here there's an example about how we can configure a mime to use with using the SQL Command,

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a lambda update function configuration and giving the function name and set the environment variables

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in here.

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So let me copy these lines and paste in here and hit enter.

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This will be edit or configuration and we can verify from the these configurations in here.

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Let me refresh this page.

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And see that the bucket employment variables is added in here and also key and final text value will

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be added or configurations.

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But you should be careful about that when ah, when we are performing the update function configuration,

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this is overriding our previous employment variables.

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So that's why we can add again the table name and table name is product.

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You should careful about that.

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Okay, very good.

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So we have seen how we can configure our environment variables with using the same commands.

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When you apply implement variable with the update function configuration command, the entire context

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of the variable structure is replaced in order to retain existing employment variables.

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When you add a new one, include all the existing in your values.

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In the request of these CLI or HDC commands, we can also get the current configuration in order to

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get the current configurations, use the get function configuration.

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You can see in this command a lambda get function configuration.

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This will be provide to get all configurations for us.

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Of course this will be my function three.

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Let's see how we can.

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It's all complications from the environment variables.

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If you hit the answer, you can see that this time we can see the environment variables.

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We have three minus variable table name, bucket and key.

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So we can retrieve environment variables with this way, but also we can retrieve these values into

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our lambda function code.

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This is a very powerful feature that we don't need to change code with using the environment variables.

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For example, I think that the table name information could be changed and you can only change the environment

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variable without touching any code line.

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So how we can retrieve these values in lambda function, you can see example in here.

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This is the an example, an example lambda function that we can get environment variables from the process

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that envy that the environment variable for example, a region table name and so on.

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This will be provided to get a variable in programmatically from the lambda functions and we are using

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the environment variable function in it.

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So this is the way how we can grab the environment variables in lambda function without touching any

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code we can change the table name from the event variables and the code will be reflect with newest

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and with variable.

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As you can see that we have seen how to use a lambda employment variables.