How to fix Error: Unsuitable value type - number required in Terraform

# Incorrect: boolean in count
resource "aws_instance" "example" {
  count = var.create_instance  # true or false
}

# Correct: convert to 0 or 1
resource "aws_instance" "example" {
  count = var.create_instance ? 1 : 0
}

# Also correct: use ternary with conditions
resource "aws_instance" "example" {
  count = var.environment == "prod" ? 1 : 0
}

# Incorrect: string addition
port = var.base_port + 8080

# Correct: convert to number first
port = tonumber(var.base_port) + 8080

# Or define variable as number type
variable "base_port" {
  type = number
}

# Incorrect: complex expression may not return a number
count = var.create_vpc && length(var.subnets) > 0

# Correct: explicitly use ternary to return 0 or 1
count = var.create_vpc && length(var.subnets) > 0 ? 1 : 0

variable "instance_count" {
  type    = number
  default = 1
}

variable "port" {
  type = number
}

# Not just
variable "instance_count" {
  default = 1  # Could be interpreted as string
}

terraform console
# Check type of a variable
type(var.base_port)

# Check type of an expression
type(var.create_instance ? 1 : 0)

# Evaluate complex expressions
var.create_vpc && length(var.subnets) > 0 ? 1 : 0

terraform validate
terraform plan