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JavaScriptBeginner#numbers
JavaScriptIntermediate#objects
What is the difference between Object.freeze and const?
const prevents rebinding the variable; Object.freeze prevents adding, deleting or changing the object's own properties. freeze is shallow, so nested objects remain mutable.
Example
const o = Object.freeze({ a: 1, n: { b: 2 } });
o.a = 9; // ignored
o.n.b = 9; // works — freeze is shallow