ARM template convert to bool

arm-template-convert-to-bool.json

{
  "$schema": "https://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0",
  "parameters": {
    "authActiveDirectoryClientId": {
      "type": "string",
      "defaultValue": ""
    }
  },
  "variables": {
    "convertToBool": [
      false,
      true
    ],
    "authEnabled": "[variables('convertToBool')[length(take(parameters('authActiveDirectoryClientId'), 1))]]"
  },
  "resources": [],
  "outputs": {
    "authEnabled": {
      "value": "[variables('authEnabled')]",
      "type" : "bool"
    }
  }
}