HowProgrammingWorks
diff --git a/‎JavaScript/4-boxing.js
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+10-5Lines changed: 10 additions & 5 deletions b/‎JavaScript/4-boxing.js
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+10-5Lines changed: 10 additions & 5 deletions
diff --git a/‎JavaScript/5-closure.js
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+4-4Lines changed: 4 additions & 4 deletions b/‎JavaScript/5-closure.js
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+4-4Lines changed: 4 additions & 4 deletions
diff --git a/‎JavaScript/6-interface.js
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+6-2Lines changed: 6 additions & 2 deletions b/‎JavaScript/6-interface.js
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+6-2Lines changed: 6 additions & 2 deletions
@@ -1,20 +1,25 @@
 'use strict';
 
 class ArrayToQueueAdapter {
-  constructor(arr) {
-    this.array = arr;
+  #array = null;
+
+  constructor(array) {
+    if (!Array.isArray(array)) {
+      throw new Error('Array instance expected');
+    }
+    this.#array = array;
   }
 
   enqueue(data) {
-    this.array.push(data);
+    this.#array.push(data);
   }
 
   dequeue() {
-    return this.array.pop();
+    return this.#array.pop();
   }
 
   get count() {
-    return this.array.length;
+    return this.#array.length;
   }
 }
 
 
@@ -1,16 +1,16 @@
 'use strict';
 
-const arrayToQueueAdapter = (arr) => ({
+const arrayToQueueAdapter = (array) => ({
   enqueue(data) {
-    arr.push(data);
+    array.push(data);
   },
 
   dequeue() {
-    return arr.pop();
+    return array.pop();
   },
 
   get count() {
-    return arr.length;
+    return array.length;
   }
 });
 
 
@@ -10,11 +10,15 @@ class HashMap {
   }
 
   set(key, value) {
-    this.fs.writeFileSync(this.path + key, JSON.stringify(value), 'utf8');
+    const name = this.path + key;
+    const data = JSON.stringify(value);
+    this.fs.writeFileSync(name, data, 'utf8');
   }
 
   get(key) {
-    return JSON.parse(this.fs.readFileSync(this.path + key, 'utf8'));
+    const name = this.path + key;
+    const data = this.fs.readFileSync(name, 'utf8');
+    return JSON.parse(data);
   }
 
   has(key) {
Original file line number	Diff line number	Diff line change
`@@ -1,20 +1,25 @@`
`1`	`1`	`'use strict';`
`2`	`2`
`3`	`3`	`class ArrayToQueueAdapter {`
`4`		`- constructor(arr) {`
`5`		`- this.array = arr;`
	`4`	`+ #array = null;`
	`5`	`+`
	`6`	`+ constructor(array) {`
	`7`	`+ if (!Array.isArray(array)) {`
	`8`	`+ throw new Error('Array instance expected');`
	`9`	`+ }`
	`10`	`+ this.#array = array;`
`6`	`11`	`}`
`7`	`12`
`8`	`13`	`enqueue(data) {`
`9`		`- this.array.push(data);`
	`14`	`+ this.#array.push(data);`
`10`	`15`	`}`
`11`	`16`
`12`	`17`	`dequeue() {`
`13`		`- return this.array.pop();`
	`18`	`+ return this.#array.pop();`
`14`	`19`	`}`
`15`	`20`
`16`	`21`	`get count() {`
`17`		`- return this.array.length;`
	`22`	`+ return this.#array.length;`
`18`	`23`	`}`
`19`	`24`	`}`
`20`	`25`
Original file line number	Diff line number	Diff line change
`@@ -10,11 +10,15 @@ class HashMap {`
`10`	`10`	`}`
`11`	`11`
`12`	`12`	`set(key, value) {`
`13`		`- this.fs.writeFileSync(this.path + key, JSON.stringify(value), 'utf8');`
	`13`	`+ const name = this.path + key;`
	`14`	`+ const data = JSON.stringify(value);`
	`15`	`+ this.fs.writeFileSync(name, data, 'utf8');`
`14`	`16`	`}`
`15`	`17`
`16`	`18`	`get(key) {`
`17`		`- return JSON.parse(this.fs.readFileSync(this.path + key, 'utf8'));`
	`19`	`+ const name = this.path + key;`
	`20`	`+ const data = this.fs.readFileSync(name, 'utf8');`
	`21`	`+ return JSON.parse(data);`
`18`	`22`	`}`
`19`	`23`
`20`	`24`	`has(key) {`