JavaScript code line break: How to handle long string and object attribute access gracefully?

JavaScript code line breaking best practices

Writing clear and easy to read JavaScript code is crucial. Long lines of code not only affect readability, but also reduce the maintainability of the code. This article will explore the elegant handling of code line breaks in JavaScript, especially for long strings and complex object property access.

Unlike Python that uses backslash \ for line breaks, JavaScript has more flexible line breaks. Directly using backslashes does not work in all cases, such as document.getElementById() method call.

JavaScript mainly provides two new line breaking methods:

Method 1: String literal line wrap

For long strings, you can use a backslash \ to wrap lines inside the string literal. For example:

 var ele = document.getElementById("This is a very long ID\
in the landing page").innerText;

This method is concise and clear, and is suitable for splitting long strings into multiple lines.

Method 2: Expression line break

A more general method is to wrap lines before and after the operators of the expression to improve the readability of the code. For example:

 var ele = document
    .getElementById("This is a very long ID in the landing page")
    .innerText;

This method decomposes long expressions into multiple lines, with one method call per line, clearly showing the code logic. It is especially suitable for complex object property access or method chain calls.

Best Practice Recommendations:

• Select the appropriate newline location: Break lines at logical breakpoints, such as between method calls or before and after operators, to avoid affecting code execution.
• Keep consistency: Maintain a consistent code style throughout the project, improving code readability and maintainability.
• Using code formatting tools: Use code formatting tools (such as Prettier) to automatically format code to ensure consistency in code style.

By using the above methods reasonably, you can write clearer and easier to maintain JavaScript code. Remember that the readability of the code is a key factor in high-quality code.

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