how to comment a function in javascript

To comment a function in JavaScript, you can use either a single-line comment or a multi-line comment. The recommended way is to use the JSDoc standard by adding comments above the function that describe the function's parameters, return type, and any other relevant information.

Here is an example of commenting a function using JSDoc:

index.tsx
/**
 * Adds two numbers together
 * @param {number} num1 The first number to add
 * @param {number} num2 The second number to add
 * @returns {number} The total of num1 and num2
 */
function add(num1, num2) {
  return num1 + num2;
}
233 chars
10 lines

In this example, we use the /** character sequence to start the comment block. Then, we include a brief description of what the function does, followed by a @param tag for each parameter in the function. Each @param tag includes the parameter name and a description of what the parameter represents. Finally, we use the @returns tag to describe what the function returns.

You can generate documentation from these comments using tools like JSDoc or VSCode.