fromNumber, toNumber, fromString, toString

...like the rest of the library.

lib/opcode.js

@@ -1,8 +1,12 @@
 function Opcode(num) {
   if (!(this instanceof Opcode))
     return new Opcode(num);
+
   if (typeof num === 'number') {
     this.num = num;
+  } else if (typeof num === 'string') {
+    var str = num;
+    this.num = Opcode.map[str];
   } else if (num) {
     var obj = num;
     this.set(obj);
@@ -14,6 +18,20 @@ Opcode.prototype.set = function(obj) {
   return this;
 };
 
+Opcode.prototype.fromNumber = function(num) {
+  this.num = num;
+  return this;
+};
+
+Opcode.prototype.toNumber = function() {
+  return this.num;
+};
+
+Opcode.prototype.fromString = function(str) {
+  this.num = Opcode.map[str];
+  return this;
+};
+
 Opcode.prototype.toString = function() {
   return Opcode.reverseMap[this.num];
 };

test/opcode.js

@@ -9,8 +9,46 @@ describe('Opcode', function() {
   
   it('should convert to a string with this handy syntax', function() {
     Opcode(0).toString().should.equal('OP_0');
-    Opcode(97).toString().should.equal('OP_NOP');
     Opcode(96).toString().should.equal('OP_16');
+    Opcode(97).toString().should.equal('OP_NOP');
+  });
+  
+  it('should convert to a number with this handy syntax', function() {
+    Opcode('OP_0').toNumber().should.equal(0);
+    Opcode('OP_16').toNumber().should.equal(96);
+    Opcode('OP_NOP').toNumber().should.equal(97);
+  });
+
+  describe('#fromNumber', function() {
+    
+    it('should work for 0', function() {
+      Opcode().fromNumber(0).num.should.equal(0);
+    });
+
+  });
+  
+  describe('#toNumber', function() {
+    
+    it('should work for 0', function() {
+      Opcode().fromNumber(0).toNumber().should.equal(0);
+    });
+
+  });
+  
+  describe('#fromString', function() {
+    
+    it('should work for OP_0', function() {
+      Opcode().fromString('OP_0').num.should.equal(0);
+    });
+
+  });
+  
+  describe('#toString', function() {
+    
+    it('should work for OP_0', function() {
+      Opcode().fromString('OP_0').toString().should.equal('OP_0');
+    });
+
   });
   
   describe('@map', function() {