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Advance JavaScript

1 Introduction

This document serves as the complete definition of Google’s coding standards for source code in the JavaScript programming language. A JavaScript source file is described as being in Google Style if and only if it adheres to the rules herein.

2.3 Special characters

2.3.1 Whitespace characters

Aside from the line terminator sequence, the ASCII horizontal space character (0x20) is the only whitespace character that appears anywhere in a source file. This implies that

    
        /* Best: perfectly clear even without a comment. */
        const units = 'μs';

        /* Allowed: but unnecessary as μ is a printable character. */
        const units = '\u03bcs'; // 'μs'

        /* Good: use escapes for non-printable characters with a comment for clarity. */
        return '\ufeff' + content;  // Prepend a byte order mark.
    

    
        /* Poor: the reader has no idea what character this is. */
        const units = '\u03bcs';
    

Tip: Never make your code less readable simply out of fear that some programs might not handle non-ASCII haracters properly. If that happens, those programs are broken and they must be fixed.