The `Math.sign()`

function in JavaScript is used to determine the sign of a number. It returns `1`

if the number is positive, `-1`

if the number is negative, and `0`

if the number is zero.

Here’s an example that uses the `Math.sign()`

function:

```
console.log(Math.sign(7)); // Output: 1
console.log(Math.sign(-7)); // Output: -1
console.log(Math.sign(0)); // Output: 0
```

In the example above, the `Math.sign()`

function is used to determine the sign of three different numbers. The first call to `Math.sign(7)`

returns `1`

because `7`

is a positive number. The second call to `Math.sign(-7)`

returns `-1`

because `-7`

is a negative number. The third call to `Math.sign(0)`

returns `0`

because `0`

is neither positive nor negative.

The `Math.sign()`

function can also be used with non-integer values, such as floating-point numbers:

```
console.log(Math.sign(3.14)); // Output: 1
console.log(Math.sign(-3.14)); // Output: -1
```

In the example above, the `Math.sign()`

function is used to determine the sign of two floating-point numbers. The first call to `Math.sign(3.14)`

returns `1`

because `3.14`

is a positive number. The second call to `Math.sign(-3.14)`

returns `-1`

because `-3.14`

is a negative number.

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