Web Reference: Single Line Comments Single line comments start with //. Any text between // and the end of the line will be ignored by JavaScript (will not be executed). This example uses a single-line comment before each code line: Jul 11, 2025 · Comments help explain code (they are not executed and hence do not have any logic implementation). We can also use them to temporarily disable parts of your code. 1. Single Line Comments A single-line comment in JavaScript is denoted by two forward slashes (//), // A single line comment Feb 26, 2026 · Learn the complete syntax for writing single-line, multi-line, and documentation comments in JavaScript. Understand when to use each type and how comments affect code execution.
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