It's redundancy calls because pop should already removed the element.

samnang · Jul 18, 2023 · 2eeb264 · 2eeb264
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commit 2eeb264
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diff --git a/contracts/sample_apps/02_address_book/AddressBook.sol b/contracts/sample_apps/02_address_book/AddressBook.sol
@@ -29,7 +29,6 @@ contract AddressBook {
                     contacts[msg.sender][i] = contacts[msg.sender][length - 1];
                 }
 
-                delete contacts[msg.sender][length - 1];
                 contacts[msg.sender].pop();
 
                 delete aliases[msg.sender][contactAddress];