how to check if a number is negative in javascript code example

Example 1: makes number negative javascript

Math.abs(num) => Always positive
-Math.abs(num) => Always negative

Example 2: check if number is negative javascript

const positive = 5;
const negative = -5;
const zero = 0;

Math.sign(positive); // 1
Math.sign(negative); // -1
Math.sign(zero); // 0

Example 3: check if number is negative javascript

Math.sign() has 5 possible return values:
1 // positive number
-1 // negative number
0 // positive zero
-0 // negative zero
NaN // not a number

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