Random branching

//Apply to a path in a shape layer shape

s = thisComp.layer("Controller").effect("Random Seed")("Slider");
n = thisComp.layer("Controller").effect("Steps")("Slider");
l = thisComp.layer("Controller").effect("Max Length")("Slider");

seedRandom(s, true);
var pts = [];
var x = y = 0;
pts.push([x,y]);

for(i = 0; i < n; i++) {
    var d = Math.floor(random(l));
    var r = Math.floor(random(4));
    switch(r) {
        case 0:
            x += d;
            break;
        case 1:
            y += d;
            break;
        case 2:
            x -= d;
            break;
        case 3:
            y -= d;
            break;
    }
    pts.push([x,y]);
}

createPath(pts, [], [], false);