Learn Solidity (0.5) - Error

Find out how to use assert, require and revert to throw errors in Solidity.

[smartcontractprogrammer]

@10:34
I made a mistake on the last bullet point.
It should be revert (like require)

[ronpoletti]

Well done. I appreciate how you explained overflow and underflow conditions using a clock analogy. Very helpful.

[xLife]

Thanks a lot for this. Fantastic explanations as always man, you deserve way more subs. Keep up the great work!

[salem]

👌🏻😻 clock analogy is awesome !! Great for understanding the logic!!!

[growthactionsmedia]

Thank you very much, you are a talented teacher ! You explain very well !

[manu_a]

Great video, i love your explanations!

[福瑞黃]

The clock example is very good! I have question, At 9:43, since we already have line#11 require, so we still need the line #14 assert or not? Please advise, Thanks!

[otmaneghazal]

how to make my contract take 0.75% fee from the transfer amount? When I call the function that reads the fee percentage it always shows 0. The compiler shows no errors and i'm using SafeMath to handle overflows and underflows

[cyberdisco]

So should one avoid using assert when building smart contracts in order to avoid using all the gas? Sounds like would make more sense to stick to require and revert

[vineeshukla]

I have a question, My Transaction cost does not change. Though my execution cost decreases after using "require". Is the transaction cost static? or am I doing something wrong?