Lesson2: Why am i getting a prompt from remix IDE that pure and view cost gas?

[yeskaydee]

as you cane see from the image for Pure and View i am getting cost estimates.. why?

[kartik-giri]

Because every function cost gas in solidity. If you are explicitly writing/storing on blockchain it will cost more gas fee because miners have to mined that transaction but if you are only reading it will not cost extra gas fee.

In ethereum every transaction which occurred on the platform should be greater than the 21000 gas mark. As you can see store function cost is greater than 21000 gas mark because it is storing data while retrieve and add functions does not because they are only reading or dealing with local variable/data.
I hope my answer is helpful to you.

[kartik-giri]

In the case of ethereum we are dealing with validators so you can change the term miners with validators.

[yeskaydee]

what about
function retrieve() public view returns (uint256){ // returns(uint256) is gonna return a no which uint256 return favNo; }
for this the gas is 2415 gas, [view function]

[yeskaydee]

In the case of ethereum we are dealing with validators so you can change the term miners with validators.

?

[kartik-giri]

so yeah retrieve() function cost lesser than 21000 gas because it is not a transaction .

[pacelliv]

Hello @yeskaydee, those gas estimates only apply when the pure and view functions are called by a contract, in that case gas will be charged.

view and pure function execute a READ operation as long they are invoked by an Externally Owned Account; this is an account that knows its private key, e.g. your Metamask wallet. In this case no gas will be charged.

[alymurtazamemon]

@yeskaydee This is an execution gas because reading also needs nodes to execute some functions to give the result of the function but it is not a transaction cost which cost ethers.

[kartik-giri]

Yeah exactly

[yeskaydee]

@alymurtazamemon bro is the alchemy university course worth it?

[alymurtazamemon]

@yeskaydee Yup, its fundamentals part is amazing.

[yeskaydee]

@alymurtazamemon bro i am a complete beginner , do you have any suggestions on what path should i follow, i am in desperate need of guidance

[alymurtazamemon]

@yeskaydee I have written this guide for people like you Becoming a Blockchain Developer: A Step-by-Step Guide for Beginners. Feel free to ask any question you have after reading this.