New functions: randomElement and odds

package.json

@@ -1,6 +1,6 @@
 {
   "name": "salet",
-  "version": "1.6.21",
+  "version": "1.7.0",
   "description": "A general client-side framework for cybertext interactive fiction games.",
   "keywords": ["ifiction", "interactive fiction", "games", "coffee-script", "text", "menu"],
   "homepage": "https://salet.su",

src/random.coffee

@@ -41,6 +41,18 @@ class Random
 
   randomInt: (upper) ->
     @rand(upper)
+
+  # return a random element from an array
+  randomElement: (elements) ->
+    return elements[@rand(elements.length - 1)]
+  
+  # return odds of a (value + dN) being larger than target, rounded down
+  odds: (value, target, n) ->
+    chance = target - value
+    if chance <= 0
+      return 100
+    chance = Math.floor((1 - chance / n) * 100)
+    return chance
   
   # Returns the result of rolling *n* dice with *dx* sides, and adding *plus*.
   dice: (n = 1, dx, plus = 0) ->