Variables

Variables in jsonpatcher are block scoped, meaning that they are only accessible in the block they are defined in and any nested blocks. Due to a quirk in the implementation, functions can access variables from after they are defined as long as they are called after the variable definition.

Variables come in two flavors: mutable and immutable. Mutable variables can be changed after they are defined, while immutable variables can't. You should prefer immutable variables when possible.

Defining Variables

Variables are defined with the var and val keywords, for mutable and immutable variables respectively. After the keyword you specify the name of the variable and then assign a value to it.

var a = 1;
val b = 2;

a = 3; # we can reassign a variable with =, but only if it's mutable
b = 4; # this will cause an error

{
    val c = 4;
}
# We can't access c here