- Processing
- p5.js
- Processing.py
- Processing for Android
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- Processing Foundation

This reference is for Processing 3.0+. If you have a previous version, use the reference included with your software in the Help menu. If you see any errors or have suggestions, please let us know. If you prefer a more technical reference, visit the Processing Core Javadoc and Libraries Javadoc.

Class | JSONArray
Name | ### isNull()
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));
      }
    }
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).
Syntax |
    .isNull(index)
Parameters |
index | int: must be between 0 and length() - 1
Returns | boolean

Updated on January 9, 2020 00:33:13pm EST