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

- 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 | JSONObject
Name | ### isNull()
Examples |
    JSONObject json;

    void setup() {

      json = new JSONObject();
      json.setInt("id", 0);
      json.setString("species", null);

      if (json.isNull("species") == true) {
        println("The species is undefined");
      } else {
        println("The ID is " + json.getString("species"));
      }
    }
Description | Determines if the value associated with the key is null, that is has no defined value (false) or if it has a value (true).
Syntax |
    .isNull(key)
Parameters |
key | String: A key string.
Returns | boolean

Updated on January 1, 2021 03:38:09am EST
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