tonic + npm: reckon-js

let Reckon = require('reckon-js').default; let reckon = new Reckon({ fruits:['apple','pear','banana'], veges:['carrot','broccoli','celery'] }); let fruitCursor = reckon.select('fruits'); let fruitJoinView = fruitCursor.addView('Fruit join', fruits => fruits.join()); fruitJoinView.onUpdate(newFruitJoin=>{ console.log("New fruit join: "+newFruitJoin); }); fruitCursor.on('ADD_A_FRUIT', name => { fruitCursor.update(fruitState => fruitState.push(name)); }); fruitCursor.emit('ADD_A_FRUIT','mandarin'); fruitCursor.emit('ADD_A_FRUIT','grape');