Implove examples

tshemsedinov · tshemsedinov · commit 4e9400a08daf · 2017-11-20T19:17:04.000+02:00
diff --git a/JavaScript/1-object.js b/JavaScript/1-object.js
@@ -2,7 +2,7 @@
 
 class Dictionary {
   constructor() {
-    this.map = {};
+    this.map = Object.create(null);
   }
   set(key, value) {
     return this.map[key] = value;
@@ -11,7 +11,7 @@ class Dictionary {
     return this.map[key];
   }
   has(key) {
-    return this.map.hasOwnProperty(key);
+    return !!this.map[key];
   }
   delete(key) {
     delete this.map[key];
@@ -23,7 +23,7 @@ class Dictionary {
     return Object.keys(this.map);
   }
   clear() {
-    this.map = {};
+    this.map = Object.create(null);
   }
 }
 
diff --git a/JavaScript/2-map.js b/JavaScript/2-map.js
@@ -18,4 +18,4 @@ if (!cityPopulation.has('Shanghai')) {
 }
 
 console.log('size:', cityPopulation.size);
-console.log('keys:', cityPopulation.keys());
+console.log('keys:', [...cityPopulation.keys()]);
diff --git a/JavaScript/5-index.js b/JavaScript/5-index.js
@@ -20,8 +20,13 @@ const buildIndex = (ds, col) => {
 // Usage
 
 const dataset = getDataset('./cities.dat');
+console.log(dataset);
+
 const byName = buildIndex(dataset, 0);
+console.log(byName);
+
 const byPopulation = buildIndex(dataset, 1);
+console.log(byPopulation);
 
 const delhi = byName.get('Delhi');
 console.log(delhi);

Original file line number	Diff line number	Diff line change
`@@ -2,7 +2,7 @@`
`2`	`2`
`3`	`3`	`class Dictionary {`
`4`	`4`	`constructor() {`
`5`		`- this.map = {};`
	`5`	`+ this.map = Object.create(null);`
`6`	`6`	`}`
`7`	`7`	`set(key, value) {`
`8`	`8`	`return this.map[key] = value;`
`@@ -11,7 +11,7 @@ class Dictionary {`
`11`	`11`	`return this.map[key];`
`12`	`12`	`}`
`13`	`13`	`has(key) {`
`14`		`- return this.map.hasOwnProperty(key);`
	`14`	`+` `return !!this.map[key];`
`15`	`15`	`}`
`16`	`16`	`delete(key) {`
`17`	`17`	`delete this.map[key];`
`@@ -23,7 +23,7 @@ class Dictionary {`
`23`	`23`	`return Object.keys(this.map);`
`24`	`24`	`}`
`25`	`25`	`clear() {`
`26`		`- this.map = {};`
	`26`	`+ this.map = Object.create(null);`
`27`	`27`	`}`
`28`	`28`	`}`
`29`	`29`
Original file line number	Diff line number	Diff line change
`@@ -18,4 +18,4 @@ if (!cityPopulation.has('Shanghai')) {`
`18`	`18`	`}`
`19`	`19`
`20`	`20`	`console.log('size:', cityPopulation.size);`
`21`		`-console.log('keys:', cityPopulation.keys());`
	`21`	`+console.log('keys:', [...cityPopulation.keys()]);`