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GeezerVison is showing github.com — EventEmitter/JavaScript/tasks.txt at master · HowProgrammingWorks/EventEmitter Expand file tree/ Copy pathtasks.txtMore file actions 129 lines (99 loc) · 2.77 KB / Copy pathtasks.txtFile metadata and controls129 lines (99 loc) · 2.77 KB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 'use strict'; /* - on(name, f, timeout = 0) - удаление событие через remove созданных через once - distinct() - метод переключает emitter в режим уникальных обработчиков - names() : array of string - возвращаем все имена - listeners(name): array of function - возвращает копию массива подписок - has(name) : boolean - существуют ли обработчики - has(name, f): boolean - есть ли функция f в массиве обработчиков - prepend(name, f) - устанавливает обработчик перед всеми остальными - insert(name, f, g) - устанавливает обработчик f перед g ------------------ - wrapper, EventEmitter, mixin - wrapper, factory, prototype - factory, mixin, functor - prototype, functor, class - mixin, class, factory */ const emitter = () => { let events = {}; const ee = { on: (name, f, timeout = 0) => { const event = events[name] || []; events[name] = event; event.push(f); if (timeout) setTimeout(() => { ee.remove(name, f); }, timeout); }, emit: (name, ...data) => { const event = events[name]; if (event) event.forEach(f => f(...data)); }, once: (name, f) => { const g = (...a) => { ee.remove(name, g); f(...a); }; ee.on(name, g); }, remove: (name, f) => { const event = events[name]; if (!event) return; const i = event.indexOf(f); event.splice(i, 1); }, clear: (name) => { if (name) events[name] = []; else events = {}; }, count: (name) => { const event = events[name]; return event ? event.length : 0; }, listeners: (name) => { const event = events[name]; return event.slice(); }, names: () => Object.keys(events) }; return ee; }; // 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' }); // listeners and names ee.on('e5', () => {}); ee.on('e5', () => {}); ee.on('e6', () => {}); ee.on('e7', () => {}); console.log('listeners', ee.listeners('e5')); console.log('names', ee.names()); |
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