• ← Protect
• → ReadProtected

Protected

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Protected

is an attribute that prevents values on a symbol from
being modified.

Values of Protected symbols cannot be modified:

• • Attributes[p] = {Protected};

• • p = 2;

• • f[p] ^= 3;

• • Format[p] = "text";

However, attributes might still be set:

• • SetAttributes[p, Flat]

• • Attributes[p]

Thus, you can easily remove the attribute Protected:

• • Attributes[p] = {};

• • p = 2

You can also use Protect or Unprotect, resp.

• • Protect[p]

• • Attributes[p]

• • Unprotect[p]

If a symbol is Protected and Locked, it can never be changed again:

• • SetAttributes[p, {Protected, Locked}]

• • p = 2

• • Unprotect[p]