WordPress at a glance
function is not described

ActionScheduler_Store::instance() public WC 1.0

{} It's a method of the class: ActionScheduler_Store{}

Hooks from the method
Return

ActionScheduler_Store.

Usage

$result = ActionScheduler_Store::instance();

Code of ActionScheduler_Store::instance() WC 5.0.0

<?php
public static function instance() {
	if ( empty( self::$store ) ) {
		$class = apply_filters( 'action_scheduler_store_class', self::DEFAULT_CLASS );
		self::$store = new $class();
	}
	return self::$store;
}