From 71986e40b95c1e48bc175134419c6f7df48dfaec Mon Sep 17 00:00:00 2001
From: Audrey Tang <audreyt@audreyt.org>
Date: Sun, 6 Aug 2017 20:43:48 +0800
Subject: [PATCH] * Shuffle agents before sorting.

  Without this fix, on Safari (Mac), "grudger" ends up
  always dominating on step 4, not just sometimes.
---
 js/lib/helpers.js     | 13 ++++++++++++-
 js/sims/Tournament.js |  7 ++-----
 2 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/js/lib/helpers.js b/js/lib/helpers.js
index ebee2925..07a50160 100644
--- a/js/lib/helpers.js
+++ b/js/lib/helpers.js
@@ -173,4 +173,15 @@ function _makeMovieClip(resourceName, options){
 	// Gimme
 	return mc;
 
-}
\ No newline at end of file
+}
+
+function _shuffleArray(array) {
+	var tmp, current, top = array.length;
+	if(top) while(--top) {
+		current = Math.floor(Math.random() * (top + 1));
+		tmp = array[current];
+		array[current] = array[top];
+		array[top] = tmp;
+	}
+	return array;
+}
diff --git a/js/sims/Tournament.js b/js/sims/Tournament.js
index 12447345..d3bd0217 100644
--- a/js/sims/Tournament.js
+++ b/js/sims/Tournament.js
@@ -229,11 +229,8 @@ function Tournament(config){
 	self.agentsSorted = null;
 	self.playOneTournament = function(){
 		PD.playOneTournament(self.agents, Tournament.NUM_TURNS);
-		self.agentsSorted = self.agents.slice();
-		self.agentsSorted.sort(function(a,b){
-			if(a.coins==b.coins) return (Math.random()<0.5); // if equal, random
-			return a.coins-b.coins; // otherwise, sort as per usual
-		});
+		self.agentsSorted = _shuffleArray(self.agents.slice());
+		self.agentsSorted.sort(function(a,b){ return a.coins-b.coins; });
 	};
 
 	// Get rid of X worst