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GeezerVison is showing github.com — Symbol/JavaScript/7-hide-symbols-usage.js at master · HowProgrammingWorks/Symbol

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'use strict';
const hideSymbol = require('./6-hide-symbols.js');
let obj = {
name: 'Marcus Aurelius',
born: 121,
[Symbol.for('secret')]: 'some secret information',
[Symbol.for('notsecret')]: 'some not secret information',
get getter() {
return 'GETTER';
},
set setter(value) {},
};
console.log('\n\nBEFORE PROXYING:\n\n');
console.log('\x1b[4mfor in:\x1b[0m');
for (const i in obj) {
console.log(i);
}
console.log('\x1b[4mconsole.log("obj"):\x1b[0m');
console.log(obj);
console.log('\x1b[4mconsole.dir("obj"):\x1b[0m');
console.dir(obj, { showHidden: true, depth: null });
console.log('\x1b[4mObject.getOwnPropertyNames:\x1b[0m');
console.log(Object.getOwnPropertyNames(obj));
console.log('\x1b[4mObject.getOwnPropertySymbols:\x1b[0m');
console.log(Object.getOwnPropertySymbols(obj));
console.log(
'\x1b[4mconsole.log(Object.getOwnPropertyDescriptor(obj, ' +
'Symbol.for("secret")))\x1b[0m',
);
console.log(Object.getOwnPropertyDescriptor(obj, Symbol.for('secret')));
console.log('\x1b[4mconsole.log(Object.keys(obj)):\x1b[0m');
console.log(Object.keys(obj));
console.log('\x1b[4mconsole.log(obj[Symbol.for("secret")])\x1b[0m');
console.log(obj[Symbol.for('secret')]);
console.log('\x1b[4mconsole.log(Object.entries(obj)):\x1b[0m');
console.log(Object.entries(obj));
Object.defineProperty(obj, '_debugOutputSecretField', {
enumerable: false,
get() {
return this[Symbol.for('secret')];
},
configurable: true
});
// proxying:
obj = hideSymbol(obj, Symbol.for('secret'));
console.log('\n\nAFTER PROXYING:\n\n');
console.log('\x1b[4mfor in:\x1b[0m');
for (const i in obj) {
console.log(i);
}
console.log('\x1b[4mconsole.log("obj"):\x1b[0m');
console.log(obj);
console.log('\x1b[4mconsole.dir("obj"):\x1b[0m');
console.dir(obj, {
showHidden: true,
depth: null,
});
console.log('\x1b[4mObject.getOwnPropertyNames:\x1b[0m');
console.log(Object.getOwnPropertyNames(obj));
console.log('\x1b[4mObject.getOwnPropertySymbols:\x1b[0m');
console.log(Object.getOwnPropertySymbols(obj));
console.log(
'\x1b[4mconsole.log(Object.getOwnPropertyDescriptor(obj, ' +
'Symbol.for("secret")))\x1b[0m',
);
console.log(Object.getOwnPropertyDescriptor(obj, Symbol.for('secret')));
console.log('\x1b[4mconsole.log(Object.keys(obj)):\x1b[0m');
console.log(Object.keys(obj));
console.log('\x1b[4mconsole.log(obj[Symbol.for("secret")])\x1b[0m');
console.log(obj[Symbol.for('secret')]);
console.log('\x1b[4mconsole.log(Object.entries(obj)):\x1b[0m');
console.log(Object.entries(obj));
// overwrite:
console.log('\n\x1b[4m[Symbol.for("secret")] = "overwrite value"\x1b[0m');
obj[Symbol.for('secret')] = 'overwrite value';
console.log('\x1b[4mconsole.log("obj"):\x1b[0m');
console.log(obj);
console.log('\x1b[4mObject.getOwnPropertySymbols:\x1b[0m');
console.log(Object.getOwnPropertySymbols(obj));
console.log('\x1b[4mconsole.log(obj[Symbol.for("secret")])\x1b[0m');
console.log(obj[Symbol.for('secret')]);
console.log('\n\nREAL VALUE OF obj[Symbol.for("secret")]:\n\n');
console.log('\x1b[4mconsole.log(obj._debugOutputSecretField):\x1b[0m');
console.log(obj._debugOutputSecretField);
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