const random = require('number-random');
 
random(0,1);     // 0 or 1
random(1);       // 0 or 1
random(100);     // 0~100
random(100,999); // 100~999
random(100,999,true);   //663.7264946557116
random(100,999,4);      //346.5673
random(0,1,true);       //0.1557056098245
random();               //0.3497616536915302