Improved JavaScript examples

tshemsedinov · tshemsedinov · commit 1a511d4a013a · 2016-10-29T05:38:19.000+03:00
diff --git a/.jshintrc b/.jshintrc
@@ -0,0 +1,4 @@
+{
+  "esversion": 6,
+  "node": true
+}
diff --git a/JavaScript/1-simple.js b/JavaScript/1-simple.js
@@ -1,3 +1,5 @@
+'use strict';
+
 Function.prototype.curry = function(...args) {
   return this.bind(null, ...args);
 };
diff --git a/JavaScript/2-extended.js b/JavaScript/2-extended.js
@@ -1,3 +1,5 @@
+'use strinct';
+
 Function.prototype.curry = function(...args) {
   return this.bind(null, ...args);
 };
@@ -6,7 +8,7 @@ let 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: 1596 },
+  { name: 'Mao Zedong', city: 'Shaoshan', born: 1893 },
   { name: 'Rene Descartes', city: 'La Haye en Touraine', born: 1596 }
 ];
 
diff --git a/JavaScript/3-cached.js b/JavaScript/3-cached.js
@@ -1,8 +1,10 @@
+'use strinct';
+
 let 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: 1596 },
+  { name: 'Mao Zedong', city: 'Shaoshan', born: 1893 },
   { name: 'Rene Descartes', city: 'La Haye en Touraine', born: 1596 }
 ];
 
@@ -19,7 +21,7 @@ function projection(meta) {
       (val, fn, i) => i === 0 ? obj[fn] : fn(val), null
     ), hash
   ), {});
-};
+}
 
 let p1 = projection(md);
 let data = persons.map(p1);
diff --git a/JavaScript/4-optimized.js b/JavaScript/4-optimized.js
@@ -0,0 +1,52 @@
+'use strinct';
+
+let 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 }
+];
+
+let md = {
+  name: ['name'],
+  place: ['city', s => '<' + upper(s) + '>'],
+  age: ['born', age]
+};
+
+function projection(meta) {
+  let keys = Object.keys(meta);
+  return obj => {
+    let hash = {};
+    let def, val;
+    keys.forEach(key => {
+      def = meta[key];
+      val = obj[def[0]];
+      if (def.length > 1) val = def[1](val);
+      hash[key] = val;
+    });
+    return hash;
+  };
+}
+
+let p1 = projection(md);
+let data = persons.map(p1);
+console.dir(data);
+
+function capitalize(s) {
+  return s.replace(/\w+/g, function(word) {
+    return word.charAt(0).toUpperCase() + word.substr(1).toLowerCase();
+  });
+}
+
+function upper(s) {
+  return typeof(s) === 'string' ? s.toUpperCase() : '';
+}
+
+function age(year) {
+  return new Date().getFullYear() - new Date(year + '').getFullYear();
+}
+
+function inc(x) {
+  return ++x;
+}

-Original file line number
+Diff line change
@@ @@ -0,0 +1,4 @@ @@
 +{
 +  "esversion": 6,
 +  "node": true
 +}
Original file line number	Diff line number	Diff line change
`@@ -1,3 +1,5 @@`
	`1`	`+'use strict';`
	`2`	`+`
`1`	`3`	`Function.prototype.curry = function(...args) {`
`2`	`4`	`return this.bind(null, ...args);`
`3`	`5`	`};`