Increment a number without getting rid of leading zeroes

Question

I am getting a value from database and I am reusing it as a number. This number has leading zeroes and it is limited to only 4 digits, meaning to say the format is 0001 or 0010 or 0100 or 1000. I am starting the count from zero when I add 1 to this number the leading zeroes are gone the way I add is for example

var databasevalue = 0000;
var incrementvalue = parseInt(databasevalue) + parseInt(1); 

Answer 1

// I suppose databasevalue is a string
var databasevalue = "0125"; 

// coerce the previous variable as a number and add 1
var incrementvalue = (+databasevalue) + 1;

// insert leading zeroes with a negative slice
incrementvalue = ("0000" + incrementvalue).slice(-4); // -> result: "0126"