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Documentation→Reference→Data→Composite→JSONArray

Name

isNull()

Class

JSONArray

Description

Determines if the value associated with the index is null, that is has no defined value (false) or if it has a value (true).

Examples

JSONArray json;

void setup() {

  json = new JSONArray();

  json.setInt(0, 32);
  json.setString(1, null);

  if (json.isNull(1) == true) {
    println("This element is undefined");
  } else {
    println("The value is " + json.getString(1));
  }
}

Syntax

.isNull(index)

Parameters

index(int)must be between 0 and length() - 1

Return

boolean

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