random_walk.js

var walk = function () {
  
  return {walk_it_out: walk_it_out}
  
  function randint () {
   var r = Math.random () 
   return Math.round(r*10)
  };
  
  function get_steps (n) {
    var steps = [], step;
    for (var i=0; i < n; i++) {
      step = Math.random () < 0.5 ? -1 : 1
      steps.push(step * randint())
    }
    return steps;
  };
  
  function walk_it_out(n) {
    var start = 100
      , current = start
      , steps = get_steps(n)
    	, positions = [start];
    for (var i=0; i< steps.length; i++) {
      current += steps[i]
      positions.push(current)
    }
    return positions
  }
}()

walk.walk_it_out(1000)