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GeezerVison is showing github.com — Symbol/JavaScript/6-hide-symbols.js at master · HowProgrammingWorks/Symbol

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6-hide-symbols.js

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'use strict';
const hideSymbol = (obj, symbol) => {
obj = {
realObj: Object.assign(obj),
simulateSecretField: undefined,
};
obj = new Proxy(obj, {
ownKeys: (target) => {
if (symbol in target.realObj) {
let properties = Reflect.ownKeys(target.realObj);
const indexField = properties.indexOf(symbol);
properties.splice(indexField, 1);
if (target.simulateSecretField) {
properties = properties.concat(symbol);
}
return properties;
} else {
return Reflect.ownKeys(target);
}
},
get: (target, property) => {
if (property === symbol) {
return target.simulateSecretField;
}
return target.realObj[property];
},
set: (target, property, value) => {
if (property === symbol) {
return Reflect.set(target, 'simulateSecretField', value);
} else {
return Reflect.set(target.realObj, property, value);
}
},
getOwnPropertyDescriptor: (target, property) => {
if (property === symbol && target.simulateSecretField) {
return Object.getOwnPropertyDescriptor(target, 'simulateSecretField');
}
if (property === symbol && target.simulateSecretField === undefined) {
return undefined;
}
return Reflect.getOwnPropertyDescriptor(target.realObj, property);
},
enumerate: (target) => target.keys[Symbol.iterator],
deleteProperty(target, property) {
if (property !== symbol) {
delete target.realObj[property];
} else if (property === symbol && target.simulateSecretField) {
target.simulateSecretField = undefined;
}
return true;
},
});
return obj;
};
module.exports = hideSymbol;
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