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I'm writing a Dapp, which connect the ether web3 provided by metamask.

How should I handle the response from contract method? I mean some methods that doesn't need to send a transaction.

for example, In my contract there's a public uint field and a public address field.

the code to get the uint field

contractIns.uintField(function(err, result){
     if(err){
         //error
     } else {
         //the data is in result.c[0];
     }
});

however, the code to get the address field

contractIns.addressField(function(err, result) {
     if(err){
         //error
     } else {
         //the result is the data itself
     }
});

I mean, is there any documentation about the format of return value format?

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Solidity has integer types (like uint) that are too big for the javascript numeric type, so to avoid losing important data web3 will wrap integer types in a bignumber.js.

If you are sure the number is within the javascript range you can use the function toNumber to converto to a javascript numeric type.

contractIns.uintField(function(err, result){
     if(err){
         //error
     } else {
         //Use toNumber to convert to numeric type
         var myField = result.toNumber();
         console.log(myField);
     }
});

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