Check if a number is in a given range

JavaScript version
const inRange = (num, a, b, threshold = 0) => Math.min(a, b) - threshold <= num && num <= Math.max(a, b) + threshold;
TypeScript version
const inRange = (num: number, a: number, b: number, threshold: number = 0): boolean => Math.min(a, b) - threshold <= num && num <= Math.max(a, b) + threshold;
Examples
inRange(10, 5, 15); // true
inRange(10, 5, 6); // false
inRange(10, 15, 5); // true
inRange(-10, -5, -15); // true