A far more complete (but still draft) documentation to be found here: https://gufo.pvittet.com/doc/ .
Gufo has a strict type system and do not allow implicit conversion. For exemple we cannot add a string to an integer.
Gufo’s types are implicitely infered.
– bool : standard true/false boolean
– cmd: this is a special types representing the application of an external program. This is a basic type but owning field attributes.
– set : no order, no duplicated value.
– map : a map is a set of key values binded to values.
list, set and maps can only contains element of same type.
Gufo has ‘struct’ composite types: a struct defines a type with determined and statically typed fields.
Gufo has predefined operators: every operator takes two arguments, here denoted by ‘a’ and ‘b’:
a + b : with a and b as int (float) represents the addition of two integers(floats).
a + b : with a and b as string represents the string concatenation operation.
a – b : with a and b as int (float) represents the soustraction of two int (float)
a * b : with a and b as int (float) represents the multiplication of two int (float)
a / b : with a and b as int (float) represents the division of two int (float)
a with b : with a and b a list of elements A represent the list concatenation.
a with b : with a and b a set of elements A represent the set union.
a with b : with a and b a of elements A as key and B as values represent a map merge (a union of the key set). if a key is present in both, the binded value becomes the one from b.
a with b : with a a list of elements A and b an element of type A, return the list a with b added at the head of the list.
a with b : with a a set of elements A and b an element of type A, return the set a union the singleton set containing b.
a wout b : with a and b a set of elements A, return the set a without the elements from b.
a wout b : with a and b a map of elements A as key and B as values, return the map a without the elements from b.
The types also contains standard libraries functions accessible though system modules: for exemple $Int.toStr is the function taking an integer argument and returning the corresding value as a string.