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// DOWNLOAD THE FILES AND RUN COMPOSER INSTALL 

cd to /htdocs folder in MAMP

$ composer create-project drupal-composer/drupal-project:8.x-dev my_site_name_dir --no-interaction

// this will make a folder called /my_site_name_dir, then download lots of files and components
// make sure the memory_limit of your current MAMP php version is very high

// OPGELET: composer installeert een /web folder.
// De root van je site is vanaf nu de /web folder!

// CREATE AN EMPTY DB in MAMP

// Surf naar localhost/nieuwesite/web

// RUN THE INSTALLER

// OPGELET: installer bleef steken in Chrome, mogelijk probleem met cookies.
// FIREFOX installeert correct