Check if number is positive or negative JavaScript

Learn how to check if a number is positive or negative in JavaScript. Use if statements and comparison operators to determine if a number is greater than or less than zero. You can also add nested if…else statements to check if the number is actually a number.

if (num > 0) {
  // code to execute if number is positive
} else if (num < 0) {
  // code to execute if number is negative
} else {
  // code to execute if number is zero
}

For example check if the number is positive or negative JavaScript

Simple example code.

Check Number Type with if…else if…else

You can check if a number is positive or negative in JavaScript using an if statement and the greater than (>) or less than (<) operators.

let num = 5;

if (num > 0) {
  console.log("Number is positive");
} else if (num < 0) {
  console.log("Number is negative");
} else {
  console.log("Number is zero");
}

You can use nested if...else statements in JavaScript to check the type of a number.

let num = 5;

if (typeof num === "number") {
  if (num > 0) {
    console.log("Number is positive");
  } else if (num < 0) {
    console.log("Number is negative");
  } else {
    console.log("Number is zero");
  }
} else {
  console.log("Not a number");
}

Output:

Comment if you have any doubts or suggestions on this JS number topic.

Note: The All JS Examples codes are tested on the Firefox browser and the Chrome browser.

OS: Windows 10

Code: HTML 5 Version