mixins/array: Remove deprecated code

packages/@ember/-internals/runtime/lib/mixins/array.js

@@ -1,10 +1,9 @@
 /**
 @module @ember/array
 */
-import { ARRAY_AT_EACH } from '@ember/deprecated-features';
 import { DEBUG } from '@glimmer/env';
 import { PROXY_CONTENT } from '@ember/-internals/metal';
-import { symbol, toString, HAS_NATIVE_PROXY, tryInvoke } from '@ember/-internals/utils';
+import { symbol, HAS_NATIVE_PROXY, tryInvoke } from '@ember/-internals/utils';
 import {
   get,
   set,
@@ -15,7 +14,6 @@ import {
   aliasMethod,
   Mixin,
   hasListeners,
-  eachProxyFor,
   beginPropertyChanges,
   endPropertyChanges,
   addArrayObserver,
@@ -28,7 +26,6 @@ import Enumerable from './enumerable';
 import compare from '../compare';
 import { ENV } from '@ember/-internals/environment';
 import Observable from '../mixins/observable';
-import copy from '../copy';
 import MutableEnumerable from './mutable_enumerable';
 import { typeOf } from '../type-of';
 
@@ -1137,45 +1134,6 @@ const ArrayMixin = Mixin.create(Enumerable, {
     let predicate = value === value ? item => item !== value : item => item === item;
     return this.filter(predicate);
   },
-
-  /**
-    Returns a special object that can be used to observe individual properties
-    on the array. Just get an equivalent property on this object and it will
-    return an array that maps automatically to the named key on the
-    member objects.
-
-    `@each` should only be used in a non-terminal context. Example:
-
-    ```javascript
-    myMethod: computed('posts.@each.author', function(){
-      ...
-    });
-    ```
-
-    If you merely want to watch for the array being changed, like an object being
-    replaced, added or removed, use `[]` instead of `@each`.
-
-    ```javascript
-    myMethod: computed('posts.[]', function(){
-      ...
-    });
-    ```
-
-    @property @each
-    @deprecated
-    @public
-  */
-  '@each': ARRAY_AT_EACH
-    ? nonEnumerableComputed(function() {
-        deprecate(`Getting the '@each' property on object ${toString(this)} is deprecated`, false, {
-          id: 'ember-metal.getting-each',
-          until: '3.5.0',
-          url: 'https://emberjs.com/deprecations/v3.x#toc_getting-the-each-property',
-        });
-
-        return eachProxyFor(this);
-      }).readOnly()
-    : undefined,
 });
 
 /**
@@ -1624,19 +1582,6 @@ let NativeArray = Mixin.create(MutableArray, Observable, {
 
     return this;
   },
-
-  copy(deep) {
-    deprecate(`Using \`NativeArray#copy\` is deprecated`, false, {
-      id: 'ember-runtime.using-array-copy',
-      until: '3.5.0',
-    });
-
-    if (deep) {
-      return this.map(item => copy(item, true));
-    }
-
-    return this.slice();
-  },
 });
 
 // Remove any methods implemented natively so we don't override them

packages/@ember/-internals/runtime/tests/mixins/array_test.js

@@ -283,22 +283,6 @@ moduleFor(
       assert.equal(called, 1, 'calls observer when object is pushed');
     }
 
-    ['@test getting @each is deprecated'](assert) {
-      assert.expect(1);
-
-      expectDeprecation(() => {
-        get(ary, '@each');
-      }, /Getting the '@each' property on object .* is deprecated/);
-    }
-
-    ['@test @each is readOnly'](assert) {
-      assert.expect(1);
-
-      assert.throws(function() {
-        set(ary, '@each', 'foo');
-      }, /Cannot set read-only property "@each"/);
-    }
-
     ['@test using @each to observe arrays that does not return objects raise error'](assert) {
       let called = 0;
 
@@ -328,25 +312,6 @@ moduleFor(
       assert.equal(called, 0, 'not calls observer when object is pushed');
     }
 
-    ['@test modifying the array should also indicate the isDone prop itself has changed'](assert) {
-      // NOTE: we never actually get the '@each.isDone' property here.  This is
-      // important because it tests the case where we don't have an isDone
-      // EachArray materialized but just want to know when the property has
-      // changed.
-      let each;
-      expectDeprecation(() => {
-        each = get(ary, '@each');
-      });
-      let count = 0;
-
-      addObserver(each, 'isDone', () => count++);
-
-      count = 0;
-      let item = objectAt(ary, 2);
-      set(item, 'isDone', !get(item, 'isDone'));
-      assert.equal(count, 1, '@each.isDone should have notified');
-    }
-
     ['@test `objectAt` returns correct object'](assert) {
       let arr = ['first', 'second', 'third', 'fourth'];
       assert.equal(objectAt(arr, 2), 'third');

packages/@ember/deprecated-features/index.ts

@@ -4,7 +4,6 @@ export const SEND_ACTION = !!'3.4.0';
 export const EMBER_EXTEND_PROTOTYPES = !!'3.2.0-beta.5';
 export const RUN_SYNC = !!'3.0.0-beta.4';
 export const LOGGER = !!'3.2.0-beta.1';
-export const ARRAY_AT_EACH = !!'3.1.0-beta.1';
 export const MERGE = !!'3.6.0-beta.1';
 export const HANDLER_INFOS = !!'3.9.0';
 export const ROUTER_EVENTS = !!'3.9.0';

tests/docs/expected.js

@@ -1,7 +1,6 @@
 module.exports = {
   classitems: [
     '$',
-    '@each',
     'A',
     'EXTEND_PROTOTYPES',
     'GUID_KEY',