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‫So, so far in this course

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‫we have been doing some pretty simple Lambda functions.

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‫Just some code, no external dependencies.

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‫In the real world,

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‫you definitely need to add more dependencies

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‫with the packages and so on.

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‫And so if your Lambda function depends on extra libraries

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‫for example, the X-Ray SDK, Database Clients, et cetera.

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‫Then you need to install the packages together

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‫alongside your code and zip it all together.

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‫So if you know JS, you can use the NPM

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‫and the node_modules directory.

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‫For Python,

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‫you can use the PIP management as target options.

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‫For Java,

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‫you can include their relevant .jar file.

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‫So each language has its own way of packaging

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‫the dependencies.

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‫But what you need to remember

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‫is that you zip it all together.

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‫So the code and the dependencies together

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‫you zip it all together,

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‫and then you upload the zip straight into Lambda

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‫if it's less than 50 megabytes,

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‫otherwise first into Amazon S3

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‫and then reference it from Lambda.

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‫What about native libraries?

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‫Well, they first needs to be compiled

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‫on Amazon Linux and then they will work.

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‫And what about the AWS SDK?

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‫Well, by default, the SDK comes with every Lambda function.

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‫So if you're just using the AWS SDK,

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‫you don't need to package the SGK alongside your code.

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‫Okay, so let's go ahead

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‫and do a hands-on to see how that works.