other-operators.md

title	weight	description
Other operators	373	You will find a description of other operators.

---

What are they?

Operadores	Exemplo	Ação
isNull	"@{isNull(context)}"	Operator that verifies if the parameter is null.
isEmpty	"@{isEmpty(")}"	Operator that receives an input and verify if it is empty.
length	"@{length(tamanho)}"	Operator that receives an input and returns its size.

Example

A context with numbersArray id that has [0, 1, 2, 3, 4] as value and the operation length was used in one component Text to get the size of this array, see below:

{{< tabs id="T146" >}} {{% tab name="JSON" %}}

{{% playground file="otherOperators.json" language="en" %}} {{% /tab %}} {{% tab name="Kotlin" %}}

fun screen() = Screen(child = 
    Container(
        context = ContextData(id = "numbersArray", value = arrayOf(0,1,2,3,4)),
        children = listOf(
            Text(text = "Array [0, 1, 2, 3, 4] has size: "),
            Text(
                expressionOf("@{length(numbersArray)}")
            ).setStyle{ backgroundColor = constant("#00FF00") }
        )
    )
)

{{% /tab %}} {{< /tabs >}}