wip

util.js

@@ -22,6 +22,11 @@ export function deepEqual(a, b) {
   return true;
 }
 
+// zip two arrays
+export function zip(a, b) {
+  return a.map((k, i) => [k, b[i]]);
+}
+
 export class DefaultMap {
   constructor(defaultValue, ...rest) {
     this.defaultValue = defaultValue;