minor refactor

lib/bcoin/hd.js

@@ -114,18 +114,12 @@ function Mnemonic(options) {
   if (!options)
     options = {};
 
-  if (Buffer.isBuffer(options)) {
-    this.seed = options;
-    options = {};
-  } else {
-    this.seed = null;
-  }
-
   this.bits = options.bits || 128;
   this.entropy = options.entropy;
   this.phrase = options.phrase;
   this.passphrase = options.passphrase || '';
   this.lang = options.lang || 'english';
+  this.seed = null;
 
   assert(this.bits >= 128);
   assert(this.bits % 32 === 0);

lib/bcoin/utils.js

@@ -73,13 +73,15 @@ utils.slice = function slice(buf, start, end) {
  * Base58
  */
 
-var base58 = '123456789ABCDEFGHJKLMNPQRSTUVWXYZ'
+var base58 = ''
+  + '123456789'
+  + 'ABCDEFGHJKLMNPQRSTUVWXYZ'
   + 'abcdefghijkmnopqrstuvwxyz';
 
-var unbase58 = base58.split('').reduce(function(out, ch, i) {
-  out[ch] = i;
-  return out;
-}, {});
+var unbase58 = {};
+
+for (var i = 0; i < base58.length; i++)
+  unbase58[base58[i]] = i;
 
 /**
  * Encode a base58 string.