JavaScript examples added

Author: tshemsedinov

.gitignore

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+node_modules
+*.log
+.DS_Store

JavaScript/1-simple.js

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+'use strict';
+
+function inc(a) {
+  return ++a;
+}
+
+let sum = function(a, b) {
+  return a + b;
+};
+
+let max = (a, b) => {
+  return a > b ? a : b;
+};
+
+console.log('inc(5) = ' + inc(5));
+console.log('sum(1, 3) = ' + sum(1, 3));
+console.log('max(8, 6) = ' + max(5, 6));

JavaScript/2-context.js

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+'use strict';
+
+let cities = ['Athens', 'Roma', 'London', 'Beijing', 'Kiev', 'Riga'];
+let f = s => s.length;
+
+function f1() {
+  let cities = ['Athens', 'Roma'];
+  let f = s => s.toUpperCase();
+  console.dir({ cities });
+  console.dir(cities.map(f));
+
+  {
+    let f = s => s.toLowerCase();
+    console.dir({ cities });
+    console.dir(cities.map(f));
+  }
+
+  {
+    let cities = ['London', 'Beijing', 'Kiev'];
+    console.dir({ cities });
+    console.dir(cities.map(f));
+  }
+
+}
+
+f1();
+
+console.dir({ cities });
+console.dir(cities.map(f));

JavaScript/3-abstraction.js

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+'use strict';
+
+let power = Math.pow;
+let square = x => power(x, 2);
+let cube = x => power(x, 3);
+
+console.log(power(10, 2));
+console.log(square(10));
+
+console.log(power(10, 3));
+console.log(cube(10));

JavaScript/4-introspection.js

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+'use strict';
+
+function inc(a) {
+  return ++a;
+}
+
+let sum = function(a, b) {
+  return a + b;
+};
+
+let max = (a, b) => {
+  return a > b ? a : b;
+};
+
+console.log('Names: ');
+console.dir({
+  inc: inc.name,
+  sum: sum.name,
+  max: max.name,
+});
+
+console.log('Argumants: ');
+console.dir({
+  inc: inc.length,
+  sum: sum.length,
+  max: max.length
+});
+
+console.log('Anonymous function: ' + function(x) { return x }.name);
+console.log('Anonymous lambda' + (x => x).name);
+
+console.log('toString: ');
+console.dir({
+  inc: inc.toString(),
+  sum: sum.toString(),
+  max: max.toString()
+});

JavaScript/5-default.js

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+'use strict';
+
+function fn(a, b = 'Hello', c = 5) {
+  console.dir({ a, b, c });
+}
+
+fn(1, 2, 3);
+fn(1, 2);
+fn(1);

JavaScript/6-spread.js

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+'use strict';
+
+let f1 = (...args) => console.log(args);
+
+f1(1, 2, 3);
+
+let f2 = (...args) => {
+  args.forEach(arg => console.log(typeof(arg) + ': ' + arg));
+};
+
+f2(1, 'Marcus', { field: 'value' });