add create_world()

1 files changed, 10 insertions, 1 deletions

diff --git a/src/util.js b/src/util.js
index 74233f4..ecae45e 100644
--- a/src/util.js
+++ b/src/util.js
@@ -10,7 +10,7 @@ export function create(obj, proto=Object.prototype) {
 };

 

 

-export function random_choice(collection, r) {

+export function random_choice(collection, r=Math.random()) {

   const idx = Math.floor(collection.length * r);

   return collection[idx];

 }

@@ -41,3 +41,12 @@ export function deepEqual(a, b, debug=false) {
     return a === b;

   }

 }

+

+

+export function apply(f, n, x0) {

+  if (n == 0) {

+    return x0;

+  } else {

+    return f(apply(f, n-1, x0));

+  }

+}