Function declaration and syntax in Blockchain / Solidity - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a function in blockchain programming?

A function is a reusable block of code that performs a specific task within a smart contract or blockchain program.

beginner

How do you declare a function in Solidity?

You declare a function using the <code>function</code> keyword, followed by the function name, parentheses for parameters, and curly braces for the function body.<br>Example: <code>function greet() public { }</code>

beginner

What does the public keyword mean in a function declaration?

It means the function can be called both inside and outside the smart contract, making it accessible to anyone interacting with the contract.

beginner

What is the purpose of function parameters?

Parameters let you send information into a function so it can use that data to perform tasks or calculations.

intermediate

How do you specify the return type of a function in Solidity?

You add a <code>returns</code> keyword after the parameter list with the type inside parentheses.<br>Example: <code>function getValue() public view returns (uint)</code>

Which keyword is used to declare a function in Solidity?

A method

B function

C func

D def

In Solidity, the keyword function is used to declare functions.

What does the public keyword in a function declaration mean?

A Function is private

B Function can only be called internally

C Function can be called externally and internally

D Function is deprecated

public means the function can be called from outside and inside the contract.

How do you specify a function returns a value in Solidity?

A Using <code>returns</code> keyword

B Using <code>output</code> keyword

C Using <code>returnType</code> keyword

D No special keyword needed

The returns keyword specifies the return type of a function.

Which symbol encloses the function body in Solidity?

A <>

B ()

C []

D {}

Curly braces { } enclose the function body.

What is the purpose of function parameters?

A To send data into a function

B To store data permanently

C To declare variables globally

D To stop function execution

Parameters allow sending data into a function to use inside it.

Explain how to declare a function in Solidity including visibility and return type.

Think about the parts you need to write a complete function.

Describe the role of function parameters and how they affect function behavior in blockchain programming.

Consider how you give information to a function.