How to check validity of an address in solidity?

Question

Here's a simple contract:

contract C {
    event myEvent(bool x, address y);
    address someAddress;

function someAddressExist(){
        if(someAddress != 0){
            myEvent(true, someAddress);
        }
    }

function setSomeAddress(address y){
        someAddress = y;
    }
}

When I try to send a transaction to any address on the test network, except 0x1, it works. What's so special about this address? Are there any other addresses like that?

Noha Abuaesh · Answer

web3.utils.isAddress(address)

Checks if a given string is a valid Ethereum address. It will also check the checksum, if the address has upper and lowercase letters.

dragosb · Answer

Im not sure...what is your understanding of a valid address? In your example the argument you specify is a perfect valid address.

An address is just a variable that can hold a 20 byte value.

To answer the edited question of the OP I can link to this thread: Not all addresses created equal?.
Basically some addresses hold some precompiled contracts so they will execute code if transactions are sent to them.

How to check validity of an address in solidity?

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