From b4b6d4d96988393e646a0d5764fcf30de1a51d43 Mon Sep 17 00:00:00 2001
From: Lawrence Forman <me@merklejerk.com>
Date: Wed, 18 Sep 2019 18:33:44 -0400
Subject: [PATCH] `@0x/contracts-test-utils`: Add `shortZip()`.

---
 contracts/test-utils/CHANGELOG.json    | 6 +++++-
 contracts/test-utils/src/index.ts      | 1 +
 contracts/test-utils/src/lang_utils.ts | 9 +++++++++
 3 files changed, 15 insertions(+), 1 deletion(-)
 create mode 100644 contracts/test-utils/src/lang_utils.ts

diff --git a/contracts/test-utils/CHANGELOG.json b/contracts/test-utils/CHANGELOG.json
index a5fff1105f..875f1fbc30 100644
--- a/contracts/test-utils/CHANGELOG.json
+++ b/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
             }
         ]
     },
diff --git a/contracts/test-utils/src/index.ts b/contracts/test-utils/src/index.ts
index 4156b23991..7df55bf89a 100644
--- a/contracts/test-utils/src/index.ts
+++ b/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';
diff --git a/contracts/test-utils/src/lang_utils.ts b/contracts/test-utils/src/lang_utils.ts
new file mode 100644
index 0000000000..0a3d923260
--- /dev/null
+++ b/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]>;
+}