Arm template: concatenate each element of an array with constant value - azure

Question

When creating an arm template is it possible to concatenate each element of an array with a constant string? Below is my created parameter and the resource I am trying to create.
"parameters": {
"servicesNames": {
"type": "array",
"defaultValue": [
"test-api-content",
"test-svc-content"
]
}
}
{
"apiVersion": "2016-03-30",
"type": "Microsoft.Network/publicIPAddresses",
"name": "[concat(parameters('servicesNames'),'pip')]",
"location": "[resourceGroup().location]",
"copy": {
"name": "PIPaddresscopy",
"count": "[length(parameters('servicesNames'))]"
},
"tags": {
"displayName": "PublicIPAddress"
}
}
I would like the output of the resource name to be created with
"test-api-contentpip"
How ever I am getting the following error
The provided parameters for language function 'concat' are invalid.
Either all or none of the parameters must be an array
Please suggest how I can concatenate each value of the element

Answer 1

Just to add to existing answer (as it is a bit unclear in my opinion).
What you are trying to do with your code - concatenate array with a string, and what you need to do is concatenate each element of the array with string.
There's a copyIndex() function that represent current iteration of the loop. and you can use array[number] to access specific member of the array. so
parameters('servicesNames')[copyIndex()]
means parameters('servicesNames')[0] and parameters('servicesNames')[1] in your case. That would effectively mean you've iterated over this array.

Answer 2

You can concatenate each value of the element by modifying your name property for your publicIpAddress resource as below.
"name": "[concat(parameters('servicesNames')[copyIndex()], 'pip')]",
copyIndex:
This function is always used with a copy object.
If no value is provided for offset, the current iteration value is returned. The iteration value starts at zero.