Convert Or Cast Expression

Conversion expressions convert the value of an expression to a target type using pre-defined built-in conversion functions. Such conversions are essential for using values of different types in the same expression and avoiding type errors.

An important example of this are print function call expressions, as the print function is a built-in function that only allows a string as a parameter. Therefore, to print out a number you first have to convert it to a string.

Syntax

EXP as TYPE;

Allowed conversions

From str to num

Converts a string to a number, if it meets the following requirements:

• Only contains numeric characters (0 - 9)
• Is not empty (length > 0)

Otherwise, if the string does not meet the above requirements, it will return NaN (Not a number). In future releases, though this will throw a ConversionError.

"203" as num; // -> 203

From num to str

Converts a number to an identical string representation of the number.

203 as str; // -> "203"

From num to bool

Converts a number to a bool. This evaluates to true if it's a non-zero value.

20 as bool; // -> true
0 as bool; // -> false

From bool to num

Converts a bool to a number. This evaluates to 1 if it's true, otherwise it's 0.

true as num; // -> 1
false as num; // -> 0

From bool to str

Converts a string to a number. This evaluates to "true" if it's true, otherwise it's "false".

true as str; // -> "true"
false as str; // -> "false"