April 2018
Intermediate to advanced
222 pages
5h 28m
English
Content preview from Solidity Programming Essentials
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The call method
The call method has resulted in a lot of confusion among developers. There is a call method available via the web3.eth object, and there is also the <<address>>.call function. These are two different functions that have different purposes.
The web3.eth call method can only make calls to a node it is connected to and is a read- only operation. It is not allowed to change the state of Ethereum. It does not generate a transaction nor does it consume any gas. It is used to call the pure, constant, and view functions.
On the other hand, call function provided by address data type can call any function available within a contract. There are times when the interface of contract, more commonly known as ABI, is not available, and so ...