Multiple methods fp example

tshemsedinov · tshemsedinov · commit 897609a6a022 · 2018-01-25T03:17:21.000+02:00
diff --git a/JavaScript/examples/8-methods.js b/JavaScript/examples/8-methods.js
@@ -0,0 +1,56 @@
+'use strict';
+
+const emitter = (l = {}, o) => (o = {
+  on: (n, f) => (l[n] = l[n] || []).push(f),
+  emit: (n, d) => (l[n] || []).map(f => f(d)),
+  once: (n, f, g) => o.on(n, g = (...a) => (f(...a), o.remove(n, g))),
+  remove: (n, f, e = l[n] || []) => e.splice(e.indexOf(f), 1),
+  clear: (n) => (n ? l[n] = [] : l = {}),
+  count: (n) => (l[n] || []).length
+});
+
+// Usage
+
+const ee = emitter();
+
+// on and emit
+
+ee.on('e1', (data) => {
+  console.dir(data);
+});
+
+ee.emit('e1', { msg: 'e1 ok' });
+
+// once
+
+ee.once('e2', (data) => {
+  console.dir(data);
+});
+
+ee.emit('e2', { msg: 'e2 ok' });
+ee.emit('e2', { msg: 'e2 not ok' });
+
+// remove
+
+const f3 = (data) => {
+  console.dir(data);
+};
+
+ee.on('e3', f3);
+ee.remove('e3', f3);
+ee.emit('e3', { msg: 'e3 not ok' });
+
+// count
+
+ee.on('e4', () => {});
+ee.on('e4', () => {});
+console.log('e4 count', ee.count('e4'));
+
+// clear
+
+ee.clear('e4');
+ee.emit('e4', { msg: 'e4 not ok' });
+ee.emit('e1', { msg: 'e1 ok' });
+
+ee.clear();
+ee.emit('e1', { msg: 'e1 not ok' });
