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uupaa/Object.freeze.md

Last active August 29, 2015 14:17
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Object.freeze, Object.isFrozen, WeakMap, localStorage
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Object.freeze.md

in Chrome

var a = { a: 1 };

var map = new WeakMap();

Object.freeze(map);
Object.isFrozen(map); // -> true
map.set(a, "123");
map.get(a);           // -> "123"  oh, no
Object.freeze(localStorage);
Object.isFrozen(localStorage); // -> false  really?
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