diff --git a/lib/repl.js b/lib/repl.js
index d3363d4bbc6fd3..dd4c1cc4cc93c7 100644
--- a/lib/repl.js
+++ b/lib/repl.js
@@ -229,7 +229,7 @@ function REPLServer(prompt,
     let awaitPromise = false;
     const input = code;
 
-    if (/^\s*\{/.test(code) && /\}\s*$/.test(code)) {
+    if (/^\s*{/.test(code) && /}\s*$/.test(code)) {
       // It's confusing for `{ a : 1 }` to be interpreted as a block
       // statement rather than an object literal.  So, we first try
       // to wrap it in parentheses, so that it will be interpreted as
@@ -1319,11 +1319,11 @@ function _memory(cmd) {
   if (cmd) {
     // Going down is { and (   e.g. function() {
     // going up is } and )
-    var dw = cmd.match(/{|\(/g);
-    var up = cmd.match(/}|\)/g);
+    let dw = cmd.match(/[{(]/g);
+    let up = cmd.match(/[})]/g);
     up = up ? up.length : 0;
     dw = dw ? dw.length : 0;
-    var depth = dw - up;
+    let depth = dw - up;
 
     if (depth) {
       (function workIt() {
@@ -1342,9 +1342,9 @@ function _memory(cmd) {
           });
         } else if (depth < 0) {
           // Going... up.
-          var curr = self.lines.level.pop();
+          const curr = self.lines.level.pop();
           if (curr) {
-            var tmp = curr.depth + depth;
+            const tmp = curr.depth + depth;
             if (tmp < 0) {
               // More to go, recurse
               depth += curr.depth;