Remove experimental array comprehension syntax

Based on an example here:
https://developer.mozilla.org/en-US/docs/Mozilla/Tech/XPCOM/Reference/Interface/nsICryptoHash#Example

1 files changed, 4 insertions, 1 deletions

diff --git a/lib/script_entries/crypto.js b/lib/script_entries/crypto.js
index d8d9c0a..9393e8b 100644
--- a/lib/script_entries/crypto.js
+++ b/lib/script_entries/crypto.js
@@ -37,11 +37,14 @@ CryptoString.prototype.init = function(hashAlgorithm, charset) {
 };
 
 CryptoString.prototype.encryptString = function(str) {
+    var me = this;
     var result = {};
     var data = this.converter.convertToByteArray(str, result);
     this.cryptoHash.update(data, data.length);
     var hash = this.cryptoHash.finish(false);
-    return [this.toHexString(hash.charCodeAt(i)) for (i in hash)].join("");
+    return Array.from(
+        hash,
+        (c, i) => me.toHexString(hash.charCodeAt(i))).join('');
 };
 
 CryptoString.prototype.toHexString = function(charCode) {