Select Random Layers.jsx

/**
 * @name Select Random Layers
 * @version 1.0
 * @author Kyle Martinez <www.kyle-martinez.com>
 *
 * @description Randomly select layers from a given composition. Layer selection is currently skewed
 * towards 20% layer selection rather than 50% layer selection.
 *
 * @license This script is provided "as is," without warranty of any kind, expressed or implied. In
 * no event shall the author be held liable for any damages arising in any way from the use of this
 * script.
 *
 * In other words, I'm just trying to help make life as an animator easier
 * "A rising tide lifts all boats." - John F. Kennedy, 1963
 */

(function() {
    app.beginUndoGroup("Select Random Layers");
    var comp = app.project.activeItem;
    var layers = comp.layers;
    var numLayers = layers.length;
    for (var l = 1; l <= numLayers; l++) {
        var random = generateRandomNumber() * 100;
        layers[l].selected = (random >= 80);
    }
    app.endUndoGroup();
})();