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Math.sign() - JavaScript | MDN

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The Math.sign() static method returns 1 or -1, indicating the sign of the number passed as argument. If the input is 0 or -0, it will be returned as-is.

console.log(Math.sign(3));
// Expected output: 1

console.log(Math.sign(-3));
// Expected output: -1

console.log(Math.sign(0));
// Expected output: 0

console.log(Math.sign("-3"));
// Expected output: -1

A number representing the sign of x:

• If x is positive, returns 1.
• If x is negative, returns -1.
• If x is positive zero, returns 0.
• If x is negative zero, returns -0.
• Otherwise, returns NaN.

Because sign() is a static method of Math, you always use it as Math.sign(), rather than as a method of a Math object you created (Math is not a constructor).

Math.sign(3); // 1
Math.sign(-3); // -1
Math.sign("-3"); // -1
Math.sign(0); // 0
Math.sign(-0); // -0
Math.sign(NaN); // NaN
Math.sign("foo"); // NaN
Math.sign(); // NaN

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