@0x/contracts-test-utils: Add shortZip().

contracts/test-utils/CHANGELOG.json

@@ -84,7 +84,11 @@
             },
             {
                 "note": "Tweaks/Upgrades to `hex_utils`, most notably `hexSlice()`",
-                "pr": "TODO"
+                "pr": 2155
+            },
+            {
+                "note": "Add `shortZip()` to `lang_utils.ts`",
+                "pr": 2155
             }
         ]
     },

contracts/test-utils/src/index.ts

@@ -50,3 +50,4 @@ export {
 export { blockchainTests, BlockchainTestsEnvironment, describe } from './mocha_blockchain';
 export { chaiSetup, expect } from './chai_setup';
 export { getCodesizeFromArtifact } from './codesize';
+export { shortZip } from './lang_utils';

contracts/test-utils/src/lang_utils.ts

@@ -0,0 +1,9 @@
+import * as _ from 'lodash';
+
+/**
+ * _.zip() that clips to the shortest array.
+ */
+export function shortZip<T1, T2>(a: T1[], b: T2[]): Array<[T1, T2]> {
+    const minLength = Math.min(a.length, b.length);
+    return _.zip(a.slice(0, minLength), b.slice(0, minLength)) as Array<[T1, T2]>;
+}