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