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I've seen some contracts like here (e.g. in line 332), use "sendTransaction" when they call contract's function. Cannot we call a function without using "sendTransaction"? As I've been calling functions without using it (on testrpc and private chain) and it works fine.

Question 1: Do we have to use "sendTransaction" when we call a contract function?

Question 2: When should we use "sendTransaction"?

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  • this question may help you.
    – Achala Dissanayake
    Commented Sep 22, 2017 at 11:45
  • It should not be necessary for a non consant function contract.method(params) is equivalente to contract.method.sendTransaction(params). And for a constant function contract.method(params) is equivalente to contract.method.callparams). I remember some version failed to recognize properly a function as constant so I've to force contract.method.call(params).
    – Ismael ♦
    Commented Sep 23, 2017 at 6:04

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There are multiple ways you can interact with smart contract depending on what you want to accomplish. Here you can find detailed explanation on what does what What is the difference between a transaction and a call?

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