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: -1Math.sign(x)xA number.
A number representing the sign of x:
x is positive, returns 1.x is negative, returns -1.x is positive zero, returns 0.x is negative zero, returns -0.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