if input between certain numbers javascript code example

Example 1: javascript number between values

Number.prototype.between = function(a, b) {
  var min = Math.min.apply(Math, [a, b]),
    max = Math.max.apply(Math, [a, b]);
  return this > min && this < max;
};

var windowSize = 550;

console.log(windowSize.between(500, 600));

Example 2: if between two numbers javascript

if (500 < thenumber && thenumber < 600) {
  // ...
}