abulka

engine.entity('single-step').setComponent('housekeeping', {})

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engine.on('tick:before', (engine) => {
    todos = []  // reset
})

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let todos = []

engine.system('gather-todos-for-save', ['data'], (entity, { data }) => {
    todos_data.push(data)
});

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engine.on('tick:after', (engine) => {
    console.log('-'.repeat(40))
})

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engine.entity('single-step').setComponent('housekeeping', {})
...
engine.system('reset-todos', ['housekeeping'], (entity, { housekeeping }) => {
    // this code will run once per tick
})

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// process all entities with data component
engine.system('process-all', ['data'], (entity, { data }) => {
    console.log(`Found entity ${entity} with data ${data}`)
});

// all entities with data component and dirty component
engine.system('find-dirty', ['data', 'dirty'], (entity, { data, dirty }) => {
    console.log(`Found dirty entity ${entity}`)
});

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console.log(
    e.name, 
    JSON.stringify(e.getComponent('Name')), 
    JSON.stringify(e.getComponent('Address'))
)

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let e = engine.entity('person 1')
e.setComponent('Name', {firstname:'John', surname:'Smith'})
e.setComponent('Address', {number: 12, street: 'Bounty Drive', state: 'WA'})

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const engine = new Engine();

engine.entity(util.uuid()).setComponent('data', {title:'make lunch',  completed:true})
engine.entity(util.uuid()).setComponent('data', {title:'wash dishes',  completed:false})

engine.system('report', ['data'], (entity, { data }) => {
    let is_or_is_not = data.completed ? 'is' : 'is not'
    console.log(`Todo item ${data.title} has id ${entity.name} and ${is_or_is_not} completed`)
});
engine.tick()

abulka

class TodoItem {
    constructor(title, completed, id) {
        this.title = title
        this.completed = completed
        this.id = id == undefined ? util.uuid() : id
    }
    report() {
        let is_or_is_not = this.completed ? 'is' : 'is not'
        console.log(`Todo item ${this.title} ${is_or_is_not} completed`)
    }