Example - Removing items in inventories based on predicates

Say we wanted to remove items in your inventory (I know, the /clear command does this, but this is the only example I could come up with). To do this, we'll use the following command structure:

/rem <item>

We implement this with a simple for loop over the player's inventory and remove items that satisfy the predicate.

// Declare our arguments
LinkedHashMap<String, Argument> arguments = new LinkedHashMap<>();
arguments.put("items", new ItemStackPredicateArgument());

// Register our command
new CommandAPICommand("rem")
.withArguments(arguments)
.executesPlayer((player, args) -> {
	
    // Get our predicate
	@SuppressWarnings("unchecked")
	Predicate<ItemStack> predicate = (Predicate<ItemStack>) args[0];
    
	for(ItemStack item : player.getInventory()) {
		if(predicate.test(item)) {
			player.getInventory().remove(item);
		}
	}
})
.register();