In C# whenever I wanted to print two digit numbers I've used
int digit=1;
Console.Write(digit.ToString("00"));
How can I do the same action in Javascript ?
Thanks
-
possible duplicate of Javascript printf/string.formatJerod Venema– Jerod Venema2011-06-02 21:43:05 +00:00Commented Jun 2, 2011 at 21:43
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4 Answers
c# digit.toString("00") appends one zero to the left of digit (left padding). In javascript I use this functon for that:
function zeroPad(nr,base){
var len = (String(base).length - String(nr).length)+1;
return len > 0? new Array(len).join('0')+nr : nr;
}
zeroPad(1,10); //=> 01
zeroPad(1,100); //=> 001
zeroPad(1,1000); //=> 0001
You can also rewrite it as an extention to Number:
Number.prototype.zeroPad = Number.prototype.zeroPad ||
function(base){
var nr = this, len = (String(base).length - String(nr).length)+1;
return len > 0? new Array(len).join('0')+nr : nr;
};
//usage:
(1).zeroPad(10); //=> 01
(1).zeroPad(100); //=> 001
(1).zeroPad(1000); //=> 0001
[edit oct. 2021]
A static es20xx Number method, also suitable for negative numbers.
Number.padLeft = (nr, len = 2, padChr = `0`) =>
`${nr < 0 ? `-` : ``}${`${Math.abs(nr)}`.padStart(len, padChr)}`;
console.log(Number.padLeft(3));
console.log(Number.padLeft(284, 5));
console.log(Number.padLeft(-32, 12));
console.log(Number.padLeft(-0)); // Note: -0 is not < 0
2 Comments
Thomas Tempelmann
It should be noted that this won't work with negative numbers, i.e. it's made to work with positive numbers only. (Only saying this because I was looking for a similar formatter that deals with neg numbers as well.)
jrasm91
I would like to point out that, 8 years later, this is what
padStart does, which major browsers support. developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…I usually just do something like
("00000000"+nr).slice(-base) where nr is the number and base is the number of digits you want to end up with.
Comments
One way would be to download sprintf for javascript and writing something like this:
int i = 1;
string s = sprintf("%02d", i);
document.write(s); // Prints "01"
Comments
var num =10
document.write(num);
But if your question is to use two digit numbers twice then you can use this
var num1 = 10;
var num2 = 20;
var resultStr = string.concat(num1,num2);
document.write(resultStr);
...
Result: 1020
if you want a space in between,
var resultStr = string.concat(num1,"",num2);
Hope this helps...
5 Comments
Hubro
I think was op wants is padding the number if it's < 10, so 1 becomes string 01 or 001
nfechner
This wont help, as it doesn't address the problem of String formatting. (e.g. the op wants to have something like
i=1 ==> "01")Hubro
Nope, you didn't understand. Your answer has nothing to do with string padding
Anubhav Ranjan
@codemonkey: before your first comment came, I was actually modifying the code so couldn't look at it and after saving, the page updated with your comment. So it's not that I have not understood. I have understood it properly. Thanks anyways....
Hubro
You still haven't understood it. Your answer still has nothing to do with STRING PADDING. Op was looking for a way to fill out a string with zeros to ensure a fixed length. For instance, 1 becomes "001"