Learning Solidity : Tutorial 7 Extending String Functionality and Bytes

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Many thanks!

[DaBossLewis]

Going through all your sol vids now. Best pure sol tutorial I've found online so far 👍🏼.

[Bunchhieng]

You're the best. Thanks so much for this great tutorial.

[mbharatm]

Nice video! Helps understand the fact that for loops are required for some things, and that they are usable in solidity (just expensive for large strings!)

Might be a good idea to put up a text on the screen that we *can* directly create a bytes variable called _newValue of the correct length. Otherwise, people might think it's not possible or something!

[AyushSharma-uxfk]

Can you suggest some exercises along with these tutorials just the get the complete feel of Solidity.
PS : I really like your videos.

[majmunOR]

Another way to concatenate strings is using abi.encodePacked() method. But make sure to cast it as string before you return it:

return ", "Solidity"));

[egorsilaev]

Thanks a lot. You're very help me

[mohamedgrissa]

Thank you for the great tutorials. I am wondering if there is a way to replace one character within a string in solidity

[zacharricoupet]

Hi, thanks for those excellent videos. I was just curious: why is it important to put an "internal" modifier to the methods of the library ?

[Marcus-pqvb]

Can you explain more about "memory" you used for converting string to bytes, not able to get that properly

[Noisecooore]

Your librabry would create an out of gas exception on really really long strings wouldn't it ? Since it's a loop with no cap?

[iblockdev]

In the Strings library on line 16 you have incremented j++ without having it initialized. Can you explain what is the default value that is for j in this case.

[spidermax]

Hi, Thanks for the videos. I have one question. When should we use "new" keyword. is it just for arrays? I'm confused about "new" if you or anyone can help me I would appreciate it a lot.

[xzybit]

Thanks for your tutorial. Something bother me. I heard that loops are bad things to do use contracts.

[rahulkothari]

Why exactly is it advised to use bytes and not strings? More specifically, is there a reason why you decided to convert everything into bytes? ALSO, why "internal" is used?

[augustuscaesar]

Why do you create _tmpValue and then cast to bytes? Why not just create a new bytes(len) variable?

[taylordawson]

I am not sure if I am doing something wrong, however, if you take the code directly from the Github and run it in Remix IDE it returns an empty string. Anyone else having this issue? Thanks!

[DJOverlast]

Why is testConcat not:

function testConcat(string _base) returns (string) {
return concat(_base, "_suffix");
}

I am so confus

[siddharthr]

Whats the actual reason to use memory or stack. Why cant we just declare something as bytes without prefixing with memory?

[elixirautomation]

Getting an error while execution of testConcat function.
Status: 0x0 Transaction mined but execution failed
gas: gas
Transaction Cost: gas
Execution Cost: 39978088 gas

Decoded Input:
{
"string _base" : "Prefix"
}
Decoded Output:
{
"0" : "string" : "
}

[mwaikul]

What your saying is getting muffled by the sound of your typing.