String insert values

string-insert-values/index.js

@@ -0,0 +1,6 @@
+// https://www.codewars.com/kata/529b54d9aba78c924d00088e/javascript
+
+const format = function (str, obj) {
+  const truthy = (val, def) => typeof val === 'undefined' ? def : val;
+  return str.replace(/\{\w+\}/g, a => truthy(obj[a.slice(1, a.length-1)], a));
+};