/* EXAMPLE

document.write(addLeadingZeros([1,2,3,4,5,6,7,8,9,10]));

*/

function addLeadingZeros(array) {
	
	var highestInt = Math.max.apply(Math,array);
	
	for(var i=0; i<array.length; i++) {
		
		var nLeadingZeros =  highestInt.toString().length - array[i].toString().length;
		
		for(var j=0; j<nLeadingZeros; j++) array[i] = '0' + array[i];
	}
	
	return array;
}

/* EXAMPLE

document.write(addleadingzeros([1,2,3,4,5,6,7,8,9,10]));

*/

function addleadingzeros(array) {
	
	var highestint = Math.max.apply(Math,array);
	
	for(var i=0; i<array.length; i++) {
		
		var nleadingzeros =  highestint.toString().length - array[i].toString().length;
		
		for(var j=0; j<nleadingzeros; j++) array[i] = '0' + array[i];
	}
	
	return array;
}

This JavaScript code snippet checks each integer in an array. If necessary, one or more leading zeros are added to an integer. Note that each integer becomes a string.

add leading zeros

javascript, list, array

JavaScript