diff --git a/jest/__snapshots__/bundles-snapshot.test.js.snap b/jest/__snapshots__/bundles-snapshot.test.js.snap
index b8248e1a..82cd60af 100644
--- a/jest/__snapshots__/bundles-snapshot.test.js.snap
+++ b/jest/__snapshots__/bundles-snapshot.test.js.snap
@@ -370,63 +370,6 @@ exports[`Dist bundle is unchanged 1`] = `
     return LruMapCache;
   }();
 
-  var RrObjectCache = /*#__PURE__*/function () {
-    function RrObjectCache(_temp) {
-      var _ref = _temp === void 0 ? {} : _temp,
-          cacheSize = _ref.cacheSize;
-
-      validateCacheSize(cacheSize);
-      this.clear();
-      this._cacheSize = cacheSize;
-    }
-
-    var _proto = RrObjectCache.prototype;
-
-    _proto.set = function set(key, selectorFn) {
-      if (this._cacheLength >= this._cacheSize) {
-        this._randomReplace(key, selectorFn);
-      } else {
-        this._cache[key] = selectorFn;
-        this._cacheKeys[this._cacheLength] = key;
-        this._cacheLength++;
-      }
-    };
-
-    _proto.get = function get(key) {
-      return this._cache[key];
-    };
-
-    _proto.remove = function remove(key) {
-      var index = this._cacheKeys.indexOf(key); // O(1)
-
-
-      if (index > -1) {
-        delete this._cache[key];
-        this._cacheLength--;
-        this._cacheKeys[index] = this._cacheKeys[this._cacheLength];
-      }
-    };
-
-    _proto.clear = function clear() {
-      this._cache = {};
-      this._cacheKeys = [];
-      this._cacheLength = 0;
-    };
-
-    _proto._randomReplace = function _randomReplace(newKey, newValue) {
-      var index = Math.floor(Math.random() * this._cacheLength);
-      delete this._cache[this._cacheKeys[index]];
-      this._cacheKeys[index] = newKey;
-      this._cache[newKey] = newValue;
-    };
-
-    _proto.isValidCacheKey = function isValidCacheKey(cacheKey) {
-      return isStringOrNumber(cacheKey);
-    };
-
-    return RrObjectCache;
-  }();
-
   var RrMapCache = /*#__PURE__*/function () {
     function RrMapCache(_temp) {
       var _ref = _temp === void 0 ? {} : _temp,
@@ -440,13 +383,12 @@ exports[`Dist bundle is unchanged 1`] = `
     var _proto = RrMapCache.prototype;
 
     _proto.set = function set(key, selectorFn) {
-      if (this._cacheLength >= this._cacheSize) {
+      if (this._cache.size >= this._cacheSize) {
         this._randomReplace(key, selectorFn);
       } else {
         this._cache.set(key, selectorFn);
 
-        this._cacheKeys[this._cacheLength] = key;
-        this._cacheLength++;
+        this._cacheKeys[this._cache.size] = key;
       }
     };
 
@@ -460,19 +402,17 @@ exports[`Dist bundle is unchanged 1`] = `
 
       if (index > -1) {
         delete this._cache[\\"delete\\"](key);
-        this._cacheLength--;
-        this._cacheKeys[index] = this._cacheKeys[this._cacheLength];
+        this._cacheKeys[index] = this._cacheKeys[this._cache.size];
       }
     };
 
     _proto.clear = function clear() {
       this._cache = new Map();
       this._cacheKeys = [];
-      this._cacheLength = 0;
     };
 
     _proto._randomReplace = function _randomReplace(newKey, newValue) {
-      var index = Math.floor(Math.random() * this._cacheLength);
+      var index = Math.floor(Math.random() * this._cache.size);
 
       this._cache[\\"delete\\"](this._cacheKeys[index]);
 
@@ -491,7 +431,6 @@ exports[`Dist bundle is unchanged 1`] = `
   exports.LruMapCache = LruMapCache;
   exports.LruObjectCache = LruObjectCache;
   exports.RrMapCache = RrMapCache;
-  exports.RrObjectCache = RrObjectCache;
   exports.createCachedSelector = createCachedSelector;
   exports.createStructuredCachedSelector = createStructuredCachedSelector;
   exports[\\"default\\"] = createCachedSelector;
diff --git a/src/cache/README.md b/src/cache/README.md
index 014f8660..91ce7264 100644
--- a/src/cache/README.md
+++ b/src/cache/README.md
@@ -11,7 +11,6 @@
 | [`FlatObjectCache`](./FlatObjectCache.js) | `number` `string` |            flat unlimited             |           JS object            |
 | [`FifoObjectCache`](./FifoObjectCache.js) | `number` `string` | [first in first out][docs-fifo-cache] |           JS object            |
 |  [`LruObjectCache`](./LruObjectCache.js)  | `number` `string` | [least recently used][docs-lru-cache] |           JS object            |
-|   [`RrObjectCache`](./RrObjectCache.js)   | `number` `string` |  [random replacement][docs-rr-cache]  |           JS object            |
 |    [`FlatMapCache`](./FlatMapCache.js)    |        any        |            flat unlimited             | [Map object][docs-mozilla-map] |
 |    [`FifoMapCache`](./FifoMapCache.js)    |        any        | [first in first out][docs-fifo-cache] | [Map object][docs-mozilla-map] |
 |     [`LruMapCache`](./LruMapCache.js)     |        any        | [least recently used][docs-lru-cache] | [Map object][docs-mozilla-map] |
diff --git a/src/cache/RrMapCache.js b/src/cache/RrMapCache.js
index cde4ad65..26fd685f 100644
--- a/src/cache/RrMapCache.js
+++ b/src/cache/RrMapCache.js
@@ -1,5 +1,4 @@
 import validateCacheSize from './util/validateCacheSize';
-import isStringOrNumber from './util/isStringOrNumber';
 
 export default class RrMapCache {
   constructor({cacheSize} = {}) {
@@ -8,12 +7,11 @@ export default class RrMapCache {
     this._cacheSize = cacheSize;
   }
   set(key, selectorFn) {
-    if (this._cacheLength >= this._cacheSize) {
+    if (this._cache.size >= this._cacheSize) {
       this._randomReplace(key, selectorFn);
     } else {
       this._cache.set(key, selectorFn);
-      this._cacheKeys[this._cacheLength] = key;
-      this._cacheLength++;
+      this._cacheKeys[this._cache.size] = key;
     }
   }
   get(key) {
@@ -23,17 +21,15 @@ export default class RrMapCache {
     const index = this._cacheKeys.indexOf(key); // O(1)
     if (index > -1) {
       delete this._cache.delete(key);
-      this._cacheLength--;
-      this._cacheKeys[index] = this._cacheKeys[this._cacheLength];
+      this._cacheKeys[index] = this._cacheKeys[this._cache.size];
     }
   }
   clear() {
     this._cache = new Map();
     this._cacheKeys = [];
-    this._cacheLength = 0;
   }
   _randomReplace(newKey, newValue) {
-    const index = Math.floor(Math.random() * this._cacheLength);
+    const index = Math.floor(Math.random() * this._cache.size);
     this._cache.delete(this._cacheKeys[index]);
     this._cacheKeys[index] = newKey;
     this._cache.set(newKey, newValue);
diff --git a/src/cache/RrObjectCache.js b/src/cache/RrObjectCache.js
deleted file mode 100644
index 6440ed48..00000000
--- a/src/cache/RrObjectCache.js
+++ /dev/null
@@ -1,44 +0,0 @@
-import validateCacheSize from './util/validateCacheSize';
-import isStringOrNumber from './util/isStringOrNumber';
-
-export default class RrObjectCache {
-  constructor({cacheSize} = {}) {
-    validateCacheSize(cacheSize);
-    this.clear();
-    this._cacheSize = cacheSize;
-  }
-  set(key, selectorFn) {
-    if (this._cacheLength >= this._cacheSize) {
-      this._randomReplace(key, selectorFn);
-    } else {
-      this._cache[key] = selectorFn;
-      this._cacheKeys[this._cacheLength] = key;
-      this._cacheLength++;
-    }
-  }
-  get(key) {
-    return this._cache[key];
-  }
-  remove(key) {
-    const index = this._cacheKeys.indexOf(key); // O(1)
-    if (index > -1) {
-      delete this._cache[key];
-      this._cacheLength--;
-      this._cacheKeys[index] = this._cacheKeys[this._cacheLength];
-    }
-  }
-  clear() {
-    this._cache = {};
-    this._cacheKeys = [];
-    this._cacheLength = 0;
-  }
-  _randomReplace(newKey, newValue) {
-    const index = Math.floor(Math.random() * this._cacheLength);
-    delete this._cache[this._cacheKeys[index]];
-    this._cacheKeys[index] = newKey;
-    this._cache[newKey] = newValue;
-  }
-  isValidCacheKey(cacheKey) {
-    return isStringOrNumber(cacheKey);
-  }
-}
diff --git a/src/cache/__tests__/RrObjectCache.spec.js b/src/cache/__tests__/RrObjectCache.spec.js
deleted file mode 100644
index 4d69bf55..00000000
--- a/src/cache/__tests__/RrObjectCache.spec.js
+++ /dev/null
@@ -1,12 +0,0 @@
-import {RrObjectCache as CacheObject} from '../../../src/index';
-import testBasicBehavior from '../__util__/testBasicBehavior';
-import testRrBehavior from '../__util__/testRrBehavior';
-import testCacheSizeOptionValidation from '../__util__/testCacheSizeOptionValidation';
-import testObjectCacheKeyBehavior from '../__util__/testObjectCacheKeyBehavior';
-
-describe('RrObjectCache', () => {
-  testBasicBehavior(CacheObject, {cacheSize: 10});
-  testRrBehavior(CacheObject);
-  testCacheSizeOptionValidation(CacheObject);
-  testObjectCacheKeyBehavior(CacheObject, {cacheSize: 10});
-});
diff --git a/src/index.d.ts b/src/index.d.ts
index c417aeb6..749886cf 100644
--- a/src/index.d.ts
+++ b/src/index.d.ts
@@ -4327,15 +4327,6 @@ export class LruObjectCache implements ICacheObject {
   isValidCacheKey(key: ObjectCacheKey): boolean;
 }
 
-export class RrObjectCache implements ICacheObject {
-  constructor(options: {cacheSize: number});
-  set(key: ObjectCacheKey, selectorFn: any): void;
-  get(key: ObjectCacheKey): any;
-  remove(key: ObjectCacheKey): void;
-  clear(): void;
-  isValidCacheKey(key: ObjectCacheKey): boolean;
-}
-
 export class FlatMapCache implements ICacheObject {
   set(key: any, selectorFn: any): void;
   get(key: any): any;
diff --git a/src/index.js b/src/index.js
index c0f19317..4830a675 100644
--- a/src/index.js
+++ b/src/index.js
@@ -11,5 +11,4 @@ export {default as LruObjectCache} from './cache/LruObjectCache';
 export {default as FlatMapCache} from './cache/FlatMapCache';
 export {default as FifoMapCache} from './cache/FifoMapCache';
 export {default as LruMapCache} from './cache/LruMapCache';
-export {default as RrObjectCache} from './cache/RrObjectCache';
 export {default as RrMapCache} from './cache/RrMapCache';