Simple JavaScript examples

Author: tshemsedinov

.gitignore

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+node_modules
+*.log
+.DS_Store

JavaScript/1-object.js

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+'use strict';
+
+let obj1 = {};
+obj1.name = 'Marcus';
+obj1.city = 'Roma';
+obj1.born = 121;
+
+let obj2 = new Object();
+obj2.name = 'Marcus';
+obj2.city = 'Roma';
+obj2.born = 121;
+
+let obj3 = {
+  name: 'Marcus',
+  city: 'Roma',
+  born: 121
+};
+

JavaScript/2-object-access.js

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+'use strict';
+
+let person = {
+  name: 'Marcus',
+  city: 'Roma',
+  born: 121
+};
+
+console.log('Person name is: ' + person.name);
+console.log('Person name is: ' + person['name']);
+
+delete person.name;
+console.dir({ person });
+
+delete person['city'];
+console.dir({ person });

JavaScript/3-properties.js

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+'use strict';
+
+let person = {
+  name: 'Marcus',
+  city: 'Roma',
+  born: 121
+};
+
+if ('name' in person) {
+  console.log('Person name is: ' + person.name);
+}
+
+for (let key in person) {
+  let value = person[key];
+  console.dir({ key, value });
+}

JavaScript/5-array.js

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+'use strict';
+
+let letters = [];
+letters.push('B');
+console.dir({ letters });
+letters.unshift('A');
+console.dir({ letters });
+letters.push('C');
+console.dir({ letters });
+
+let numbers = [];
+
+let languages = ['C++', 'JavaScript', 'Python', 'Haskell', 'Swift'];
+console.dir({
+  length: languages.length,
+  'languages[0]': languages[0],
+  'languages[languages.length-1]': languages[languages.length-1]
+});

JavaScript/9-serialization.js

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+'use strict';
+
+let person = {
+  name: 'Marcus',
+  city: 'Roma',
+  born: 121
+};
+
+let s = JSON.stringify(person);
+console.log(s);
+
+let obj = JSON.parse(s);
+console.dir(obj);
+
+let letters = ['A', 'B', 'C', 'D'];
+console.log(letters + '');
+console.log(JSON.stringify(letters));