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40 lines
638 B
40 lines
638 B
const watch = (target, callback)=>{
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for(const key in target){
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if(typeof target[key] === 'object'){
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target[key] = watch(target[key], callback)
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}
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}
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return new Proxy(
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target,
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{
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set: (target, prop, newValue) => {
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target[prop] = newValue
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if(Array.isArray(target) && prop === 'length'){
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return true
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}
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callback()
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return true
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}
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}
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)
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}
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const state = watch(
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{
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name: 'matt',
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friend: {
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name: 'bob'
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},
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stuff: ['bag', 123, true]
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},
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() => {
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console.log(state);
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}
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)
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console.log(state);
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state.name = 'Matthew'
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state.friend.name = 'Bilbo'
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state.stuff[0] = 'fun'
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state.stuff.push('weeee')
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