Conversion operators

You will find a description of the conversion operators.

What are they?

Operators	Example	Action
int	“@{int(‘2’)}”	Operator that receives an input of type double or string and converts to int if possible, returns null otherwise.
double	“@{double(1)}”	Operator that receives an input of type int or string and converts to double if possible, returns null otherwise.
string	“@{string(1.2)}”	Operator that receives an input of type int, double or bool and converts to string if possible, returns null otherwise.

Example

Suppose there is a custom operator factorial that takes a parameter int and returns the factorial of that number. We can use the int operator to convert the context value “5” with id content, see below:

JSON
Kotlin

fun screen() = Screen(child = 
    Container(
        context = ContextData(id = "content", value = constant("5")),
        children = listOf(
            Text(
                expressionOf("@{factorial(int(content))}")
            )
        )
    )
)

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Last modified October 21, 2022: type coercion on operations doc (#905) (c67fc671)