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Task/Probabilistic-choice/Sidef/probabilistic-choice.sidef

@@ -0,0 +1,41 @@
+define TRIALS = 1e4;
+ 
+func prob_choice_picker(options) {
+    var n = 0;
+    var a = [];
+    options.each { |k,v|
+        n += v;
+        a << [n, k];
+    }
+    func {
+        var r = 1.rand;
+        a.first{|e| r <= e[0] }[1];
+    }
+}
+ 
+var ps = Hash(
+   aleph  => 1/5,
+   beth   => 1/6,
+   gimel  => 1/7,
+   daleth => 1/8,
+   he     => 1/9,
+   waw    => 1/10,
+   zayin  => 1/11
+)
+ 
+ps{:heth} = (1 - ps.values.sum)
+ 
+var picker = prob_choice_picker(ps)
+var results = Hash()
+ 
+TRIALS.times {
+    results{picker()} := 0 ++;
+}
+ 
+say "Event   Occurred  Expected  Difference";
+for k,v in (results.sort_by {|k| results{k} }.reverse) {
+    printf("%-6s  %f  %f  %f\n",
+        k, v/TRIALS, ps{k},
+        abs(v/TRIALS - ps{k})
+    );
+}