feat: New Matreshka.Array methods: keys, values, entries

src/array/_pseudonativemethods/entries.js

@@ -0,0 +1,11 @@
+// returns pairs like [index, value]
+export default function values() {
+    const { length } = this;
+    const result = new Array(length);
+
+    for(let i = 0; i < length; i++) {
+        result[i] = [i, this[i]];
+    }
+
+    return result;
+}

src/array/_pseudonativemethods/index.js

@@ -1,8 +1,13 @@
 import createPseudoNativeMethod from './createpseudonativemethod';
 import concat from './concat';
+import keys from './keys';
+import values from './values';
+import entries from './entries';
 
 const splitBySpaceReg = /\s+/;
-const methods = { concat };
+const methods = { concat, keys, values, entries };
+
+// TODO copyWithin, fill, find, findIndex, includes
 
 `push pop unshift shift sort reverse splice map filter slice every
 some reduce reduceRight forEach join indexOf lastIndexOf`

src/array/_pseudonativemethods/keys.js

@@ -0,0 +1,11 @@
+// returns indexes
+export default function keys() {
+    const { length } = this;
+    const result = new Array(length);
+
+    for(let i = 0; i < length; i++) {
+        result[i] = i
+    }
+
+    return result;
+}

src/array/_pseudonativemethods/values.js

@@ -0,0 +1,11 @@
+// returns values
+export default function values() {
+    const { length } = this;
+    const result = new Array(length);
+
+    for(let i = 0; i < length; i++) {
+        result[i] = this[i];
+    }
+
+    return result;
+}

test/spec/matreshka_array/common_spec.js

@@ -30,6 +30,9 @@ describe('Matreshka.Array class', () => {
     lastIndexOf,
     map,
     some,
+    entries,
+    keys,
+    values,
     push_,
     pop_,
     unshift_,

test/spec/matreshka_array/native_methods_spec.js

@@ -123,4 +123,28 @@ describe('Matreshka.Array native methods', () => {
             ).toJSON(false)
         ).toEqual([1, 2, 3, 4, 5, 6]);
     });
+
+    it('supports keys method', () => {
+        const arr = new MatreshkaArray('foo', 'bar', 'baz');
+
+        expect(
+            arr.keys()
+        ).toEqual([0, 1, 2]);
+    });
+
+    it('supports values method', () => {
+        const arr = new MatreshkaArray('foo', 'bar', 'baz');
+
+        expect(
+            arr.values()
+        ).toEqual(arr.toJSON(false));
+    });
+
+    it('supports entries method', () => {
+        const arr = new MatreshkaArray('foo', 'bar', 'baz');
+
+        expect(
+            arr.entries()
+        ).toEqual([[0, 'foo'], [1, 'bar'], [2, 'baz']]);
+    });
 });