./1563 : https://github.com/jezen/is-thirteen var isThirteen = require('is-thirteen'); // PLEAS READ THE SOURCE CODE BECAuse we moved fast and broke things i̶s̶T̶h̶i̶r̶t̶e̶e̶n̶(̶2̶5̶)̶;̶ ̶/̶/̶ ̶f̶a̶l̶s̶e̶ i̶s̶T̶h̶i̶r̶t̶e̶e̶n̶(̶1̶3̶)̶;̶ ̶/̶/̶ ̶t̶r̶u̶e̶ // Now with elegant syntax. is(13).thirteen(); // true is(12.8).roughly.thirteen(); // true is(6).within(10).of.thirteen(); // true