Created
December 22, 2017 07:06
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Watch Object Changes with Proxy API
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'use strict'; | |
function onChange(object, onChange) { | |
const handler = { | |
get(target, property, receiver) { | |
try { | |
return new Proxy(target[property], handler); | |
} catch (err) { | |
return Reflect.get(target, property, receiver); | |
} | |
}, | |
defineProperty(target, property, descriptor) { | |
onChange(); | |
return Reflect.defineProperty(target, property, descriptor); | |
}, | |
deleteProperty(target, property) { | |
onChange(); | |
return Reflect.deleteProperty(target, property); | |
} | |
}; | |
return new Proxy(object, handler); | |
}; | |
let x = { | |
a: 1 | |
}; | |
let y = onChange(x, () => console.log(x)); //{a: 1} | |
y.a = 2 | |
console.log(x.a) //a == 2 |
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