terraform script with veriables

1. Types of Terraform variable - Number
terraform {
  required_providers {
    aws = {
      source  = "hashicorp/aws"
      version = "~> 3.0"
    }
  }
}

# Configure the AWS Provider
provider "aws" {
  region = "us-west-2"
  access_key = "xxxxxxxxxxx"
  secret_key = "xxxxxxxxxxxxxxxxxxx"
}


variable "usercount" {
  type = number
  description = "This is for demo of number variable"
  default = 3
}

resource "aws_instance" "anitha" {
  count = "${var.usercount}"
  ami = "ami-03d5c68bab01f3496"
  instance_type = "t2.micro"
  tags = {
    Name = "anitha.${count.index}"
  }
  
}

2. Types of Terraform variable - String 
provider "aws" {
  region     = "us-west-2"
  access_key = "xxxxxxxxxxxx"
  secret_key = "xxxxxxxxxxxxxxx"
}

resource "aws_instance" "first-ec2" {
  ami           = "ami-03d5c68bab01f3496" # us-west-2
  instance_type = "t2.micro"
  
  tags = {
    Name = "anitha"
  }
}

3. Types of Terraform variable – List 
terraform {
  required_providers {
    aws = {
      source  = ""hashicorp/aws"
      version = "~> 3.0"
    }
  }
}

# Configure the AWS Provider
provider "aws" {
  region = "us-west-2"
  access_key = "xxxxxxxxxxxxx"
  secret_key = "xxxxxxxxxx"
}


variable "users" {
    type    = list
    default = ["devopsschool11", "devopsschool2", "devopsschool3"]
    description = "This is for demo of list variable"
}

resource "aws_instance" "anitha" {
  ami           = "ami-03d5c68bab01f3496"
  instance_type = "t2.micro"
  tags = {
    Name = "${var.users[0]}"
  } 
 


}

4. Types of Terraform variable – Map
provider “aws” {
region = “us-west-2”
access_key = “xxxxxxxxx”
secret_key = “xxxxxxxxxxxx”
}

resource “aws_instance” “first-ec2” {
ami = “ami-03d5c68bab01f3496” # us-west-2
instance_type = “t2.micro”

tags = {
Name = “anitha”
}
}

variable “amis” {
type = “map”
default = {
“us-east-1” = “ami-b374d5a5”
“us-west-2” = “ami-4b32be2b”
}
}

resource “aws_instance” “example” {
ami = var.amis[var.region]
instance_type = “t2.micro”
}