Add functional implementation

tshemsedinov · tshemsedinov · commit ae1458e97e3e · 2019-03-19T15:05:03.000+02:00
diff --git a/JavaScript/3-function.js b/JavaScript/3-function.js
@@ -0,0 +1,69 @@
+'use strict';
+
+const renderers = {
+  abstract: () => console.log('Not implemented'),
+  console: data => {
+    console.table(data);
+  },
+  web: data => {
+    const keys = Object.keys(data[0]);
+    const line = row => '<tr>' +
+      keys.map(key => `<td>${row[key]}</td>`).join('') +
+      '</tr>';
+    const output = [
+      '<table><tr>',
+      keys.map(key => `<th>${key}</th>`).join(''),
+      '</tr>',
+      data.map(line).join(''),
+      '</table>',
+    ];
+    console.log(output.join(''));
+  },
+  markdown: data => {
+    const keys = Object.keys(data[0]);
+    const line = row => '|' +
+      keys.map(key => `${row[key]}`).join('|') + '|\n';
+    const output = [
+      '|', keys.map(key => `${key}`).join('|'), '|\n',
+      '|', keys.map(() => '---').join('|'), '|\n',
+      data.map(line).join(''),
+    ];
+    console.log(output.join(''));
+  },
+};
+
+const context = rendererName => data => {
+  const renderer = renderers[rendererName] || renderers.abstract;
+  return renderer(data);
+};
+
+// Usage
+
+const non = context('unknown');
+const con = context('console');
+const web = context('web');
+const mkd = context('markdown');
+
+const persons = [
+  { name: 'Marcus Aurelius', city: 'Rome', born: 121 },
+  { name: 'Victor Glushkov', city: 'Rostov on Don', born: 1923 },
+  { name: 'Ibn Arabi', city: 'Murcia', born: 1165 },
+  { name: 'Mao Zedong', city: 'Shaoshan', born: 1893 },
+  { name: 'Rene Descartes', city: 'La Haye en Touraine', born: 1596 },
+];
+
+console.group('Abstract Strategy:');
+non(persons);
+console.groupEnd();
+
+console.group('\nConsoleRenderer:');
+con(persons);
+console.groupEnd();
+
+console.group('\nWebRenderer:');
+web(persons);
+console.groupEnd();
+
+console.group('\nMarkdownRenderer');
+mkd(persons);
+console.groupEnd();
