javascript negative random number code example

Example 1: js random minus

var plusOrMinus = Math.random() < 0.5 ? -1 : 1;

Example 2: makes number negative javascript

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

Example 3: javascript negative infinity

// Using this will gives lowest possible starting point.
// It is useful when initiating a variable that will be compared against negative numbers.
Number.NEGATIVE_INFINITY // Or,
-INFINITY

// The opposite is INFINITY. The largest possible starting point.
Number.POSITIVE_INFINITE // Or,
INFINITY