Global functions are functions that can be called without being imported.
Here's the list:

Prints the string to the crafttweaker log as information.

ZenScript
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//print(String message);
print("Hello World!");

Returns nothing

ZenScript
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//totalActions();
totalActions();

Returns an int that shows how many global functions are registered.

Enables Debug mode.
Use of the Debug Preprocessor is preferred though.

ZenScript
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//enableDebug();
enableDebug();

Returns nothing

Checks if a given object is null.
Doesn't work on primitives!

ZenScript
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//isNull(Object o);
isNull(<minecraft:dirt>);

Returns a boolean Note: If this does not work for you, try casting the object to bool <minecraft:dirt> as bool

ZenScript
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entity instanceof IEntity;

Returns a boolean

ZenScript
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//max(int number1, int number2);
max(10, 11);

Returns the larger number

ZenScript
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//min(int number1, int number2);
min(10, 11);

Returns the lower number

ZenScript
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//pow(double number1, double number2);
pow(2.0, 4.0);

Returns a double

Field	Descrizione
Field brewing	Descrizione Accesses the Brewing Handler
Field client	Descrizione Accesses client Methods
Field events	Descrizione Accesses the Event Handler
Field format	Descrizione Accesses the Formatting Handler
Field furnace	Descrizione Accesses the Furnace Handler
Field game	Descrizione Accesses Game functions
Field itemUtils	Descrizione Accesses the ItemUtils Handler
Field loadedMods	Descrizione Accesses the loaded Mods list
Field logger	Descrizione Accesses the logger
Field oreDict	Descrizione Accesses the oreDictionary Handler
Field recipes	Descrizione Accesses the Recipe Handler
Field server	Descrizione Accesses server Methods
Field vanilla	Descrizione Accesses vanilla functions (currently only vanilla.seeds available)