how to install composer in magento 2 code example

Example 1: install magento 2 using composer

1
 composer create-project --repository-url=https://repo.magento.com/ magento/project-community-edition <install-directory-name>

Example 2: install magento 2 command line composer

composer create-project --repository-url=https://repo.magento.com/ magento/project-community-edition .