Increment a number with a max length

Question

Currently in my application I have an increment logic as below, and it fails now when b value above 9 (i.e 00010, 00011). As the limit is 4 digits which should become 0010, 0011 and so on.

How can i make value to 0010 instead of 00010

var b = 0; 
for (var p = 0; p < tabarray.length; p++)
{ 
   b = b + 1; 
   tabarray[p].ItemKey = "000" + b; 
}

Please create a [mcve] using the `<>` snippet editor. Use slice with a negative number to grab concatenated values from the end. — mplungjan, Nov 30 '16 at 09:36
I think this is pretty much a duplicate of http://stackoverflow.com/questions/1267283/how-can-i-create-a-zerofilled-value-using-javascript — SpoonMeiser, Nov 30 '16 at 09:37

score 2 · Answer 1 · answered Nov 30 '16 at 09:36

2

You could use String#slice and take only the last 4 digits.

var b = 0; 

for (var p = 0; p < 10; p++) { 
    b = b + 1; 
    console.log(("000" + b).slice(-4));
}

answered Nov 30 '16 at 09:36

Nina Scholz

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How can i convert it back to integer from string. I am currently trying with parseint but it reduces the length from 0001 to 1. – user3916007 Dec 02 '16 at 23:02
`parseInt` converts a string to a number, and the number has no length. you can use either a string or a number, but not something between. – Nina Scholz Dec 03 '16 at 07:45

Increment a number with a max length

1 Answers1