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How can I push address to dynamic array without duplication?

I’m developing a web application using Ethereum SmartContract. And I have a question.

I want to add a address to array of addresses without duplication. But I can’t do without duplication. It adds all address evenif array contains same value. Below is code.

function addTokenHolder(address _tokenHolder) returns (bool success) {   uint len = tokenHolders.length;   for(uint i = 0; i > len; i++) {     if (tokenHolders[i] == _tokenHolder) return false;   }   tokenHolders.push(_tokenHolder);   return true; } 

Please advise.

How can I push address to dynamic array without duplication?

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