further improvements

compare.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+
+if [ $# -ne 1 ]; then
+  echo "Usage: $(basename "$0") <branch>"
+  exit 1
+fi
+
+compareWith="$1"
+currentBranch="$(git branch --show-current)"
+
+if [ -n "$(git status --porcelain)" ]; then
+  echo "$currentBranch is not clean, please stash or commit your changes!"
+  exit 1
+fi
+
+hyperfine \
+  -w 5 \
+	-c "git checkout $currentBranch" \
+  -p "make build" \
+  -p "git checkout $compareWith; make build" \
+  -n "$currentBranch" \
+  -n "$compareWith" \
+  './monkey examples/fib.monkey' \
+  './monkey examples/fib.monkey'