javascript does not write semicolon

JavaScript does not write semicolons

When writing JavaScript code, one of the most common ones is the semicolon, because using semicolons to separate statements in JavaScript is one of the most basic rules. However, some developers prefer to use a semicolon-less JavaScript coding style, which is also known as "semicolon-less JavaScript." While JavaScript code without semicolons works in some cases, in most cases it can lead to errors, so many developers prefer not to use this style.

This article will explore some of the advantages and disadvantages of JavaScript code without semicolons and how developers can benefit from it.

Advantages

1. Fast coding speed

The JavaScript code style without semicolons is a "clear" programming method that can increase coding speed . Since there is no extra symbol like a semicolon, the number of lines of code will be reduced when writing code, which can make the code more compact, reduce the workload when typing, and improve the developer's work efficiency.

2. Easier

Even experienced developers often miss semicolons, which is a common mistake. The style of using JavaScript code without semicolons makes it easier for developers to write code. If all JavaScript code a developer introduces follows this style, the code will not cause errors due to missing semicolons.

3. Smaller file size

If you are developing a web application or need to process a large number of JavaScript files, the JavaScript code style without semicolons will Make your code files smaller. While this may not sound important, in systems that handle large amounts of data, file size is definitely a factor to consider and can make pages feel faster to the user.

Disadvantages

1. Can cause errors

The biggest disadvantage of JavaScript code style without semicolon is that it may cause errors, especially in multi-statement lines situation. Without the semicolon, the interpreter won't know if there is new code at the end of the code block and will then have syntactic problems.

For example, the following code does not have a semicolon:

function func() {
  return
    {
      name: "John"
    };
}
console.log(func());

In this code, a null value is actually returned, because the entire function has ended after the return keyword. If you add a semicolon, the code will run as expected:

function func() {
  return {
      name: "John"
    };
}
console.log(func());

2. Difficult to read and maintain

JavaScript coding style without semicolons can easily make code difficult to read and maintenance, especially in complex blocks of code. In this style, each statement must end with a newline character, which makes it difficult for the code to identify where the statement begins and ends, making the code difficult to understand. Additionally, working with this style of code requires careful reading and tweaking to make it easier to locate and fix errors.

3. Poor portability

JavaScript code style without semicolon may not be portable enough, because code that handles this style may exist in different JavaScript interpreters difference. Different interpreters use different algorithms to derive syntax, resulting in differences in code execution results. Therefore, if you adopt a JavaScript code style without semicolons, it may cause code incompatibility issues on different systems.

Conclusion

The JavaScript code style without semicolons can indeed improve the efficiency of code writing compared with the traditional JavaScript code style. However, it also has its drawbacks, such as the potential for errors, code that is difficult to read and maintain, and poor portability. Developers should carefully consider these pros and cons and choose a coding style that suits their situation. The most important thing is that no matter which style is adopted, developers should strictly adhere to the style and carefully check every statement when writing code to avoid errors.

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