The String object lacks a built-in method for repeating characters. After a quick internet search, I found an efficient solution. To pad leading zeros, we first need a method to repeat a character. Although this explanation may skip the details of how the prototype works, you might want to research it further.
// Add a repeat method to the String object
String.prototype.repeat = function(n)
return new Array(n + 1).join(this);
Now we can use `'0'.repeat(3)` to generate a string of three zeros ("000").
Next, let's create a short padding routine. When writing code, it's wise to think ahead and consider whether you'll need similar functionality in the future. Can you make it dynamic? Here's the padding function I came up with:
// Add a leading_zeros function
var leading_zeros = function(n, total_digits)
n = n.toString();
return '0'.repeat(total_digits - n.length) + n;
To make this work with jQuery, I prefer to create a jQuery plugin. This allows us to add a method to the jQuery object, making it easy to …Continue reading