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Tips and Tricks for Working with Solidity

In this chapter, we will be sharing some tips and tricks that we have learned while working with Solidity. These tips and tricks will help you to become more efficient and effective while working with Solidity.


Debugging can be a challenging task when it comes to working with Solidity. However, there are a few tools and techniques that can make this process easier.

  • One of the first things you should do when debugging your Solidity code is to enable debugging in your development environment. This will allow you to see the input and output of your contract at each step.
  • Another helpful tip is to use the Solidity debugger. This tool allows you to step through your code line by line and see the values of variables at each step.
  • It can also be helpful to add console logs to your code. This will allow you to see the values of variables and the output of your contract at each step.


Testing is an essential part of the development process when it comes to working with Solidity. Here are a few tips for writing effective tests:

  • Make sure to test all of the functions in your contract. This includes both positive and negative test cases.
  • Use a test coverage tool to ensure that you are testing all of the code in your contract.
  • Use test-driven development (TDD) to write your tests before you write your code. This will help you to identify any potential issues early on in the development process.


Security is a critical concern when working with Solidity. Here are a few tips for writing secure contracts:

  • Use a library like OpenZeppelin for secure contract development. These libraries provide a set of tested and secure building blocks that you can use in your contracts.
  • Use the Solidity static analyzer to identify potential vulnerabilities in your code.
  • Follow best practices for secure contract development, such as using modifier functions and the “require” function to enforce contract logic.

Working with Large Contracts

Large contracts can be challenging to work with. Here are a few tips for working with large contracts:

  • Break your contract into smaller, more manageable pieces.
  • Use libraries to organize your code and make it easier to maintain.
  • Use inheritance to reuse code and keep your contract size small.


We hope that these tips and tricks have been helpful as you work with Solidity. With these tools and techniques, you will be well on your way to becoming a proficient Solidity developer.


To review these concepts, we will go through a series of exercises designed to test your understanding and apply what you have learned.

Write a test case for a Solidity contract that includes both positive and negative test cases.

describe("MyContract", () => {
  let contract;

  beforeEach(async () => {
    contract = await MyContract.new();

  it("should return the correct value when passed a valid input", async () => {
    const result = await contract.myFunction(5);
    assert.equal(result, 10);

  it("should throw an error when passed an invalid input", async () => {
    try {
      await contract.myFunction(-1);
    } catch (error) {
      assert.equal(error.reason, "Invalid input");

What is the purpose of the Solidity pragma directive?

The pragma directive is used to specify the version of Solidity that the contract is written in, as well as any other compiler-specific options. This is useful for ensuring that the contract is compiled with the correct version of the Solidity compiler, as well as for avoiding compiler bugs and security vulnerabilities.

What is the purpose of the require() function in Solidity?

The require() function is used to check for conditions that must be met in order for a contract function to execute. If the condition is not met, the function will throw an exception and terminate execution. This is useful for ensuring that the contract functions are only executed under the correct conditions, and for providing a means of handling errors and exceptions in the contract.

What is the purpose of the emit keyword in Solidity?

The emit keyword is used to trigger an event in a Solidity contract. Events are logged entries that are stored in the contract’s transaction history and can be used to trigger external functions or to provide notifications to external clients. The emit keyword allows the contract to communicate with the outside world and to provide updates on the state of the contract.

What is the purpose of the modifier keyword in Solidity?

The modifier keyword is used to define a reusable piece of code that can be applied to one or more contract functions. Modifiers are useful for adding common functionality to multiple functions, such as checking for permission levels or ensuring that certain conditions are met before execution. This helps to avoid duplication of code and makes it easier to maintain and update the contract.