# How do I check if a value is a positive or negative number in JavaScript?Ava W

In JavaScript, you can check if a value is a positive or negative number using various methods. Here are a few approaches:
**1. Comparison Operators:**
- You can use comparison operators (>,`<`

,`>=`

,`<=`

) to check if a number is positive or negative.

`1 2 3 4 5`

`const number = 42; const isPositive = number > 0; const isNegative = number < 0;`

In this example,`number > 0`

checks if`number`

is greater than 0, indicating that it is a positive number, and`number < 0`

checks if`number`

is less than 0, indicating that it is a negative number.
**2. Math.sign():**
- The`Math.sign()`

method returns the sign of a number, indicating whether it is positive, negative, or zero.
- It returns:
-`-1`

if the number is negative,
-`0`

if the number is zero, and
-`1`

if the number is positive.

`1 2 3 4 5 6`

`const number = -42; const sign = Math.sign(number); const isPositive = sign === 1; const isNegative = sign === -1;`

In this example,`Math.sign(number)`

returns`-1`

because`number`

is negative. Then, you can check if`sign`

is equal to`1`

for positive numbers and`-1`

for negative numbers.
**3. isNaN() and isFinite():**
- To handle cases where the value may not be a number, you can combine the`isNaN()`

and`isFinite()`

functions with comparison operators.

`1 2 3 4 5`

`const value = '42'; const isPositive = Number(value) > 0 && isFinite(value); const isNegative = Number(value) < 0 && isFinite(value);`

In this example,`Number(value)`

converts`value`

to a number, and`isFinite(value)`

checks if the converted value is a finite number. The comparison operators then determine if the number is positive or negative.
Choose the method that best fits your use case and consider the specific requirements of your application. It's important to handle potential edge cases and ensure that the value being checked is indeed a number before performing comparisons.

### Similar Questions

How do I check if a value is a positive or negative number in JavaScript?

How do I check if a value is a positive or negative number in JavaScript?

How do I check if a value is a negative number in JavaScript?

How do I check if a value is a positive or negative number in JavaScript using bitwise operations?

How do I check if a value is a positive integer in JavaScript?

How do I check if a value is a positive integer in JavaScript?

How do I check if a value is a prime number in JavaScript?

How do I check if a value is a number in JavaScript?

How do I check if a value is a number in JavaScript?

How do I check if a value is a negative integer in JavaScript?

How do I check if a value is an integer in JavaScript?

How do I check if a value is a prime number in JavaScript efficiently?

How do I check if a value is an object in JavaScript?

How do I check if a value is a function in JavaScript?

How do I check if a value is a function in JavaScript?

How do I check if a number is an integer in JavaScript?

How do I check if a number is a prime number in JavaScript?

How do I check if a value is an empty string in JavaScript?