feat: add merge() function

index.js

@@ -333,4 +333,22 @@ Kareem.prototype.clone = function() {
   return n;
 };
 
+Kareem.prototype.merge = function(other) {
+  var ret = this.clone();
+  for (var key in other._pres) {
+    if (!other._pres.hasOwnProperty(key)) {
+      continue;
+    }
+    ret._pres[key] = (ret._pres[key] || []).concat(other._pres[key].slice());
+  }
+  for (var key in other._posts) {
+    if (!other._posts.hasOwnProperty(key)) {
+      continue;
+    }
+    ret._posts[key] = (ret._posts[key] || []).concat(other._posts[key].slice());
+  }
+
+  return ret;
+};
+
 module.exports = Kareem;

test/examples.test.js

@@ -337,3 +337,21 @@ describe('clone()', function() {
     assert.deepEqual(['cook'], Object.keys(k2._posts));
   });
 });
+
+describe('merge()', function() {
+  it('pulls hooks from another Kareem object', function() {
+    var k1 = new Kareem();
+    var test1 = function() {};
+    k1.pre('cook', test1);
+    k1.post('cook', function() {});
+
+    var k2 = new Kareem();
+    var test2 = function() {};
+    k2.pre('cook', test2);
+    var k3 = k2.merge(k1);
+    assert.equal(k3._pres['cook'].length, 2);
+    assert.equal(k3._pres['cook'][0].fn, test2);
+    assert.equal(k3._pres['cook'][1].fn, test1);
+    assert.equal(k3._posts['cook'].length, 1);
+  });
+});