vnetnamefromid.bicep

param vnet object
param vmName string = 'linux-vm'
param vmSize string = 'Standard_B1s'
param adminUsername string = 'takekazu.omi'
param adminPassword string {
  secure: true
}
param subnetName string = 'subnet1'
param customData string = ''
param location string = resourceGroup().location

output results object = {
  subnetId1:subnetId1
  subnetId2:subnetId2
  subnetId3:subnetId3
  vnetRef: vnetRef
  vnetName: vnetName
  vnetId: vnet.resourceId
}

var subnetId1 = resourceId(vnet.resourceId, 'subnets', subnetName)
var subnetId2 = vnet.properties.subnets[0].id
var subnetId3 = resourceId(vnet.resourceGroupName, 'Microsoft.Network/virtualNetworks/subnets', vnetName, subnetName)
var vnetRef = reference(vnet.resourceId, '2020-05-01', 'Full')
// get vnet name from vnet id
var vnetName = last(split(vnet.resourceId, '/'))