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I have used solidity smart contracts since 3 months ago, but I never used the decorator "payable".

Is it sometimes necessary to use a payable function?

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Payable is necessary if you want the method to be able to receive funds or a "value".

For example, if I create a crowdsale-contract the payable function will be handling the receiving of the funds.

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  • and what about if the method use a lot of gas ? isn't necessary to add payable decorator ? – maroodb May 18 '18 at 8:35
  • Nope, gas has nothing to do with the payable decoration. – jasper May 18 '18 at 8:37

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