As you surely already messed a bit with variables and values, you must've wondered, how CraftTweaker knows whether it's dealing with an Integer, an Item or an oreDic entry?

The easiest way of declaring a variable is using var name = value;. This creates the variable and casts it to the value it thinks is most fitting for the situation.

More complex scripts might require you to cast a variable as a specific type. For example, this would fail:

ZenScript
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var test;

test = <minecraft:dirt>;
recipes.remove(test);

So why does this fail? This is because CT casts variables that aren't given a start value to the IAny Type. That type was made to facilitate some recipe handlers, though never really implemented, so it sometimes does more harm than good. It was originally intended as a type that can take the form of most other types so you don't need to change variables all the time, but the interface never got implemented.

Back to the topic: How can we fix this issue? By casting the variable test to IItemStack, which is the type used for items. Unfortunately, some types need to be imported first, and this is one of those.

ZenScript
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import crafttweaker.item.IItemStack;
var test as IItemStack;

test = <minecraft:dirt>;
recipes.remove(test);

Here's an (incomplete) List of most variable types

Name (Name in CT)	Explanation	Example	Import
Name (Name in CT) Integer (int)	Explanation Integers are whole Numbers (e.g. 1,2,3,...), caps at 2 147 483 647	Example var test = 10 as int;	Import ​
Name (Name in CT) IItemStack	Explanation Single items	Example var test = <minecraft:dirt> as IItemStack;	Import import crafttweaker.item.IItemStack;
Name (Name in CT) IIngredient	Explanation Single or Multiple Items (e.g. <minecraft:dirt>, <ore:ingotIron>,...)	Example var test = <minecraft:dirt> as IIngredient;	Import import crafttweaker.item.IIngredient;
Name (Name in CT) IOreDictEntry	Explanation Multiple Items from an OreDict (e.g. <ore:ingotIron>, <ore:ingotGold>,...)	Example var test = <ore:ingotIron> as IOreDictEntry;	Import import crafttweaker.oredict.IOreDictEntry
Name (Name in CT) Boolean (bool)	Explanation Booleans are either true or false.	Example var test = false as bool;	Import ​
Name (Name in CT) Byte (byte)	Explanation Bytes values are whole numbers from 0 to 255 ()	Example var test = 125 as byte;	Import ​
Name (Name in CT) Floating Point (float)	Explanation Decimals	Example var test = 1.25 as float;	Import ​
Name (Name in CT) Double Precision (double)	Explanation Like Floating Points, just more precise and with a higher number range	Example var test = 1.25 as double;	Import ​
Name (Name in CT) Long (long)	Explanation Like Integer, but with a higher number range (usually int is just fine)	Example var test = 30 as long;	Import ​
Name (Name in CT) Null (null)	Explanation Null, nothing, nada. Not really a type but still useful	Example var test = null;	Import ​
Name (Name in CT) Short (short)	Explanation Like Integer, but with a smaller number Range	Example var test = 16 as short;	Import ​
Name (Name in CT) String (string)	Explanation A string is a text. Here you usually won't need the "as" as anything in "s is automatically a string.	Example var test = "Hello World!" as string;	Import ​
Name (Name in CT) Void (void)	Explanation Even less than null. You will probably only need the void type when dealing with functions	Example var test as void;	Import ​
Name (Name in CT) ILiquidStack	Explanation Same as IItemStack, only for liquids	Example var test = <liquid:water> as ILiquidStack;	Import import crafttweaker.liquid.ILiquidStack;