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In JavaScript there are two ways to write comments: Line comments are introduced with `//` and are valid until the end of the line. Block comments start with `/*` and end with `*/`. Any text in between is a comment.
``````// That's a line comment.

// This line comment
// covers 2 lines.

/* That's a block comment. */

/* This block comment
covers 2 lines. */

/**
* This is also a block comment.
* the beginning and the end of the
* block comment are only for decoration.
*/``````
Block comments are often used to explain functions. Line comments explain the code flow.
``````/**
* Checks whether a string contains
* any characters other than spaces.
*/
function isBlank(string) {
// The method trim() removes spaces at
// the beginning and the end of a string.
let trimmedString = string.trim();
return trimmedString.length === 0;
}``````
Comments can't be checked with the tests used here. It follows a task where you have to apply much of what you have learned so far.

Exercise

Write a function `median` that takes an array of ascending numbers and returns the median of that numbers.

Example: `median([1, 2, 10])` should return `2` and `median([1, 2, 10, 100])` should return `6`.
The median of a sorted series of numbers is the value in the middle. If the number of values is even, the median is the mean of the two middle numbers.

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