diff --git a/lib/6to5/transformation/helpers/build-conditional-assignment-operator-transformer.js b/lib/6to5/transformation/helpers/build-conditional-assignment-operator-transformer.js
new file mode 100644
index 0000000000..a3bad77c73
--- /dev/null
+++ b/lib/6to5/transformation/helpers/build-conditional-assignment-operator-transformer.js
@@ -0,0 +1,75 @@
+var t = require("../../types");
+
+module.exports = function (opts) {
+  var getObjRef = function (node, nodes, file, scope) {
+    var obj = node.object;
+    var temp = scope.generateUidBasedOnNode(obj, file);
+    nodes.push(t.variableDeclaration("var", [
+      t.variableDeclarator(temp, obj)
+    ]));
+    return temp;
+  };
+
+  var getPropRef = function (node, nodes, file, scope) {
+    var prop = node.property;
+    var key = t.toComputedKey(node, prop);
+    if (t.isLiteral(key)) return key;
+
+    var temp = scope.generateUidBasedOnNode(prop, file);
+    nodes.push(t.variableDeclaration("var", [
+      t.variableDeclarator(temp, prop)
+    ]));
+    return temp;
+  };
+
+  var buildAbsoluteRef = function (node, nodes, file, scope) {
+    if (t.isIdentifier(node)) return node;
+
+    var obj = getObjRef(node, nodes, file, scope);
+    var prop = getPropRef(node, nodes, file, scope);
+
+    var computed = node.computed || t.isLiteral(prop);
+    return t.memberExpression(obj, prop, computed);
+  };
+
+  var buildAssignment = function (left, right) {
+    return t.assignmentExpression("=", left, right);
+  };
+
+  var exports = {};
+
+  exports.ExpressionStatement = function (node, parent, scope, context, file) {
+    var expr = node.expression;
+    if (!opts.is(expr)) return;
+
+    var nodes = [];
+    var left  = buildAbsoluteRef(expr.left, nodes, file, scope);
+
+    nodes.push(t.ifStatement(
+      opts.build(left, file),
+      t.expressionStatement(buildAssignment(left, expr.right))
+    ));
+
+    return nodes;
+  };
+
+  exports.AssignmentExpression = function (node, parent, scope, context, file) {
+    if (t.isExpressionStatement(parent)) return;
+    if (!opts.is(node)) return;
+
+    var nodes = [];
+    var left  = buildAbsoluteRef(node.left, nodes, file, scope);
+
+    nodes.push(t.logicalExpression(
+      "&&",
+      opts.build(left, file),
+      buildAssignment(left, node.right)
+    ));
+
+    nodes.push(left);
+
+    return t.toSequenceExpression(nodes, scope);
+  };
+
+  return exports;
+};
diff --git a/lib/6to5/transformation/helpers/explode-unary.js b/lib/6to5/transformation/helpers/explode-unary.js
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/lib/6to5/transformation/transformers/playground-mallet-operator.js b/lib/6to5/transformation/transformers/playground-mallet-operator.js
index 3e8fc83bf5..16333c82e5 100644
--- a/lib/6to5/transformation/transformers/playground-mallet-operator.js
+++ b/lib/6to5/transformation/transformers/playground-mallet-operator.js
@@ -1,86 +1,18 @@
 var t = require("../../types");
 
-var isMallet = function (node) {
-  var is = t.isAssignmentExpression(node) && node.operator === "||=";
-  if (is) {
-    var left = node.left;
-    if (!t.isMemberExpression(left) && !t.isIdentifier(left)) {
-      throw new Error("Expected type MemeberExpression or Identifier");
+module.exports = require("../helpers/build-conditional-assignment-operator-transformer")({
+  is: function (node) {
+    var is = t.isAssignmentExpression(node) && node.operator === "||=";
+    if (is) {
+      var left = node.left;
+      if (!t.isMemberExpression(left) && !t.isIdentifier(left)) {
+        throw new Error("Expected type MemeberExpression or Identifier");
+      }
+      return true;
     }
-    return true;
+  },
+
+  build: function (node) {
+    return t.unaryExpression("!", node, true);
   }
-};
-
-var getObjRef = function (node, nodes, file, scope) {
-  var obj = node.object;
-  if (t.isIdentifier(obj)) return obj;
-
-  var temp = scope.generateUidBasedOnNode(obj, file);
-  nodes.push(t.variableDeclaration("var", [
-    t.variableDeclarator(temp, obj)
-  ]));
-  return temp;
-};
-
-var getPropRef = function (node, nodes, file, scope) {
-  var prop = node.property;
-  var key = t.toComputedKey(node, prop);
-  if (t.isLiteral(key)) return key;
-
-  var temp = scope.generateUidBasedOnNode(prop, file);
-  nodes.push(t.variableDeclaration("var", [
-    t.variableDeclarator(temp, prop)
-  ]));
-  return temp;
-};
-
-var buildAbsoluteRef = function (node, nodes, file, scope) {
-  if (t.isIdentifier(node)) return node;
-
-  var obj = getObjRef(node, nodes, file, scope);
-  var prop = getPropRef(node, nodes, file, scope);
-
-  var computed = node.computed || t.isLiteral(prop);
-  return t.memberExpression(obj, prop, computed);
-};
-
-var buildIsFalsey = function (node) {
-  return t.unaryExpression("!", node, true);
-};
-
-var buildAssignment = function (left, right) {
-  return t.assignmentExpression("=", left, right);
-};
-
-exports.ExpressionStatement = function (node, parent, file, scope) {
-  var expr = node.expression;
-  if (!isMallet(expr)) return;
-
-  var nodes = [];
-  var left = buildAbsoluteRef(expr.left, nodes, file, scope);
-
-  nodes.push(t.ifStatement(
-    buildIsFalsey(left),
-    t.expressionStatement(buildAssignment(left, expr.right))
-  ));
-
-  return nodes;
-};
-
-exports.AssignmentExpression = function (node, parent, file, scope) {
-  if (t.isExpressionStatement(parent)) return;
-  if (!isMallet(node)) return;
-
-  var nodes = [];
-  var left = buildAbsoluteRef(node.left, nodes, file, scope);
-
-  nodes.push(t.logicalExpression(
-    "&&",
-    buildIsFalsey(left),
-    buildAssignment(left, node.right)
-  ));
-
-  nodes.push(left);
-
-  return t.toSequenceExpression(nodes, scope);
-};
+});
diff --git a/lib/6to5/transformation/transformers/playground-memoization-operator.js b/lib/6to5/transformation/transformers/playground-memoization-operator.js
index 1bd6d004ee..06c5f32405 100644
--- a/lib/6to5/transformation/transformers/playground-memoization-operator.js
+++ b/lib/6to5/transformation/transformers/playground-memoization-operator.js
@@ -1,88 +1,20 @@
 var t = require("../../types");
 
-var isMemo = function (node) {
-  var is = t.isAssignmentExpression(node) && node.operator === "?=";
-  if (is) t.assertMemberExpression(node.left);
-  return is;
-};
+module.exports = require("../helpers/build-conditional-assignment-operator-transformer")({
+  is: function (node) {
+    var is = t.isAssignmentExpression(node) && node.operator === "?=";
+    if (is) t.assertMemberExpression(node.left);
+    return is;
+  },
 
-var getPropRef = function (nodes, member, file, scope) {
-  var prop = member.property;
-  var key = t.toComputedKey(member, member.property);
-  if (t.isLiteral(key)) {
-    return key;
-  } else {
-    var temp = scope.generateUidBasedOnNode(prop, file);
-    nodes.push(t.variableDeclaration("var", [
-      t.variableDeclarator(temp, prop)
-    ]));
-    return temp;
+  build: function (node, file) {
+    return t.unaryExpression(
+      "!",
+      t.callExpression(
+        t.memberExpression(file.addHelper("has-own"), t.identifier("call")),
+        [node.object, node.property]
+      ),
+      true
+    );
   }
-};
-
-var getObjRef = function (nodes, obj, file, scope) {
-  var temp = scope.generateUidBasedOnNode(obj, file);
-  nodes.push(t.variableDeclaration("var", [
-    t.variableDeclarator(temp, obj)
-  ]));
-  return temp;
-};
-
-var buildHasOwn = function (obj, prop, file) {
-  return t.unaryExpression(
-    "!",
-    t.callExpression(
-      t.memberExpression(file.addHelper("has-own"), t.identifier("call")),
-      [obj, prop]
-    ),
-    true
-  );
-};
-
-var buildAbsoluteRef = function (left, obj, prop) {
-  var computed = left.computed || t.isLiteral(prop);
-  return t.memberExpression(obj, prop, computed);
-};
-
-var buildAssignment = function (expr, obj, prop) {
-  return t.assignmentExpression("=", buildAbsoluteRef(expr.left, obj, prop), expr.right);
-};
-
-exports.ExpressionStatement = function (node, parent, scope, context, file) {
-  var expr = node.expression;
-  if (!isMemo(expr)) return;
-
-  var nodes = [];
-
-  var left = expr.left;
-  var obj  = getObjRef(nodes, left.object, file, scope);
-  var prop = getPropRef(nodes, left, file, scope);
-
-  nodes.push(t.ifStatement(
-    buildHasOwn(obj, prop, file),
-    t.expressionStatement(buildAssignment(expr, obj, prop))
-  ));
-
-  return nodes;
-};
-
-exports.AssignmentExpression = function (node, parent, scope, context, file) {
-  if (t.isExpressionStatement(parent)) return;
-  if (!isMemo(node)) return;
-
-  var nodes = [];
-
-  var left = node.left;
-  var obj  = getObjRef(nodes, left.object, file, scope);
-  var prop = getPropRef(nodes, left, file, scope);
-
-  nodes.push(t.logicalExpression(
-    "&&",
-    buildHasOwn(obj, prop, file),
-    buildAssignment(node, obj, prop)
-  ));
-
-  nodes.push(buildAbsoluteRef(left, obj, prop));
-
-  return t.toSequenceExpression(nodes, scope);
-};
+});
diff --git a/test/fixtures/transformation/playground/mallet-operator/actual.js b/test/fixtures/transformation/playground/mallet-operator/actual.js
deleted file mode 100644
index 0c287674e4..0000000000
--- a/test/fixtures/transformation/playground/mallet-operator/actual.js
+++ /dev/null
@@ -1,17 +0,0 @@
-obj ||= {};
-
-obj.x ||= 2;
-
-console.log(obj.x ||= 2);
-
-obj.x.x ||= 2;
-
-console.log(obj.x.x ||= 2);
-
-obj[x()] ||= 2;
-
-console.log(obj[x()] ||= 2);
-
-obj[y()][x()] ||= 2;
-
-console.log(obj[y()][x()] ||= 2);
diff --git a/test/fixtures/transformation/playground/mallet-operator/exec.js b/test/fixtures/transformation/playground/mallet-operator/exec.js
index e82d33882e..b784b844bd 100644
--- a/test/fixtures/transformation/playground/mallet-operator/exec.js
+++ b/test/fixtures/transformation/playground/mallet-operator/exec.js
@@ -88,3 +88,19 @@ assert.equal(obj, 2);
 
 obj = 0;
 assert.equal(obj ||= 2 , 2);
+
+var calls = 0;
+var q = { q: 3 };
+var o = {
+  get p() {
+    calls++;
+    return q;
+  }
+};
+
+o.p.q ||= 2;
+assert.equal(1, calls);
+o.p.f ||= 2;
+assert.equal(2, calls);
+assert.equal(3, o.p.q);
+assert.equal(2, o.p.f);
diff --git a/test/fixtures/transformation/playground/mallet-operator/expected.js b/test/fixtures/transformation/playground/mallet-operator/expected.js
deleted file mode 100644
index 28b7439356..0000000000
--- a/test/fixtures/transformation/playground/mallet-operator/expected.js
+++ /dev/null
@@ -1,29 +0,0 @@
-"use strict";
-
-var _obj$x2, _x2, _obj$y2, _x4;
-if (!obj) obj = {};
-if (!obj.x) obj.x = 2;
-
-
-console.log((!obj.x && (obj.x = 2), obj.x));
-
-var _obj$x = obj.x;
-if (!_obj$x.x) _obj$x.x = 2;
-
-
-console.log((_obj$x2 = obj.x, !_obj$x2.x && (_obj$x2.x = 2), _obj$x2.x));
-
-var _x = x();
-
-if (!obj[_x]) obj[_x] = 2;
-
-
-console.log((_x2 = x(), !obj[_x2] && (obj[_x2] = 2), obj[_x2]));
-
-var _obj$y = obj[y()];
-var _x3 = x();
-
-if (!_obj$y[_x3]) _obj$y[_x3] = 2;
-
-
-console.log((_obj$y2 = obj[y()], _x4 = x(), !_obj$y2[_x4] && (_obj$y2[_x4] = 2), _obj$y2[_x4]));
diff --git a/test/fixtures/transformation/playground/memoization-assignment-operator/actual.js b/test/fixtures/transformation/playground/memoization-assignment-operator/actual.js
deleted file mode 100644
index b2d1521e2c..0000000000
--- a/test/fixtures/transformation/playground/memoization-assignment-operator/actual.js
+++ /dev/null
@@ -1,13 +0,0 @@
-var obj = {};
-
-obj.x ?= 2;
-
-console.log(obj.x ?= 2);
-
-obj[x()] ?= 2;
-
-console.log(obj[x()] ?= 2);
-
-obj[y()][x()] ?= 2;
-
-console.log(obj[y()][x()] ?= 2);
diff --git a/test/fixtures/transformation/playground/memoization-assignment-operator/exec.js b/test/fixtures/transformation/playground/memoization-assignment-operator/exec.js
index 3e528c641d..716aca45a7 100644
--- a/test/fixtures/transformation/playground/memoization-assignment-operator/exec.js
+++ b/test/fixtures/transformation/playground/memoization-assignment-operator/exec.js
@@ -18,3 +18,19 @@ assert.equal(obj.x, undefined);
 
 obj = { x: undefined }
 assert.equal(obj.x ?= 2, undefined);
+
+var calls = 0;
+var q = { q: 3 };
+var o = {
+  get p() {
+    calls++;
+    return q;
+  }
+};
+
+o.p.q ?= 2;
+assert.equal(1, calls);
+o.p.f ?= 2;
+assert.equal(2, calls);
+assert.equal(3, o.p.q);
+assert.equal(2, o.p.f);
diff --git a/test/fixtures/transformation/playground/memoization-assignment-operator/expected.js b/test/fixtures/transformation/playground/memoization-assignment-operator/expected.js
deleted file mode 100644
index fbb64ac4f8..0000000000
--- a/test/fixtures/transformation/playground/memoization-assignment-operator/expected.js
+++ /dev/null
@@ -1,27 +0,0 @@
-"use strict";
-
-var _obj2, _obj4, _x2, _obj$y2, _x4;
-var _hasOwn = Object.prototype.hasOwnProperty;
-var obj = {};
-
-var _obj = obj;
-if (!_hasOwn.call(_obj, "x")) _obj.x = 2;
-
-
-console.log((_obj2 = obj, !_hasOwn.call(_obj2, "x") && (_obj2.x = 2), _obj2.x));
-
-var _obj3 = obj;
-var _x = x();
-
-if (!_hasOwn.call(_obj3, _x)) _obj3[_x] = 2;
-
-
-console.log((_obj4 = obj, _x2 = x(), !_hasOwn.call(_obj4, _x2) && (_obj4[_x2] = 2), _obj4[_x2]));
-
-var _obj$y = obj[y()];
-var _x3 = x();
-
-if (!_hasOwn.call(_obj$y, _x3)) _obj$y[_x3] = 2;
-
-
-console.log((_obj$y2 = obj[y()], _x4 = x(), !_hasOwn.call(_obj$y2, _x4) && (_obj$y2[_x4] = 2), _obj$y2[_x4]));