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nairihar/weak_set_example.js

Created July 9, 2018 12:45
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JavaScript series, part 3, WeakMap and WeakSet, medium
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weak_set_example.js
const weakSet = new WeakSet();
const obj = {};
weakSet.add(obj);
weakSet.has(obj);
// true
weakSet.delete(obj);
// true
weakSet.add(1);
// Uncaught TypeError: Invalid value used in weak set
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