using-loops-and-conditions.md

< Using loops and conditions

Use the scripts and Bicep files that are in the simple-storage-account demo as a starting point for this lab.

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Challenge

You may want to deploy multiple storage accounts in a single deployment; we are going to start with adding a parameter to the deployment that allows you to specify the number of storage accounts to deploy.

Here are some starting code snippets for you to use:

• [for i in range(0, storageLoopCount): { }]
• '${i}sa${uniqueString(resourceGroup().id)}'

Once you have that working; have a look at the output and how it has changed.

We have now added a loop into the deployment, but we have not yet added any conditions. We can use the if keyword to add conditions to our deployment. For example, we can add a deployStorageAccounts bool parameter and add if (deployStorageAccounts) within our loop. Try adding that now and see what happens (See final hint if required).

If you get on well with the above, consider the common scenario where a deployment may need to deploy the same configured resource to many regions and how a loop can be used to achieve this. Hint: You may need to look at the Loops Syntax and also update the locations parameter.

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Hints

Error: Code=InvalidTemplate

If you removed the storageAccountName parameter from the Bicep file you will also need to remove it from the simple-storage-account.parameters.json file.

Parameters Hint

@description('Storage loop counter')
@minValue(1)
param storageLoopCount int = 3

Output Hint

output storageAccounts array = [for i in range(0, storageLoopCount): {
  id: sa[i].id
  name:sa[i].name
  blobEndpoint: sa[i].properties.primaryEndpoints.blob
  status: sa[i].properties.statusOfPrimary
}]

Condition Hint

Add the parameter:

@description('Do we deploy the storage account or not?')
param deployStorageAccount bool = true

Update the loop:

output storageAccounts array = [for i in range(0, storageLoopCount): {
  id: sa[i].id
  name:sa[i].name
  blobEndpoint: sa[i].properties.primaryEndpoints.blob
  status: sa[i].properties.statusOfPrimary
}]

Note that the outputs will either error (if this is a greenfield deployment) or wrong (if brownfield) as we are looping using a count.