Generate random lines

generateRandomLines.js

// Generate Random Lines In Adobe Illustrator

// change numberOfLines as you wish
// Run in Illustrator with File / Scripts / Other Script

var myDoc = app.activeDocument;

var numberOfLines = 4000;

// example line
var myLine1 = myDoc.pathItems.add();
myLine1.stroked = true;
myLine1.setEntirePath([
  [220, 475],
  [375, 300],
  [200, 300],
]);

// all the other generated lines
for (var i = 0; i < numberOfLines; i++) {
  var startX = Math.random() * 1000;
  var startY = Math.random() * 1000;
  var endX = Math.random() * 1000;
  var endY = Math.random() * 1000;

  var myNewLine = myDoc.pathItems.add();
  myNewLine.stroked = true;
  myNewLine.setEntirePath([
    [startX, startY],
    [endX, endY],
  ]);
}

generateRandomPath.js

var myDoc = app.activeDocument;

var numberOfLines = 1000;

// generate one long path with 4000 points
const pointArray = [];
for (var i = 0; i < numberOfLines; i++) {
  var pointX = Math.random() * 1000;
  var pointY = Math.random() * 1000;
  pointArray.push([pointX, pointY]);
}

var myNewLine = myDoc.pathItems.add();
myNewLine.setEntirePath(pointArray);