Javascript: concatenating "000" to a number and string

Question

I have these epochs:

1586998726 and "1586998726"

I need to turn both to:

1586998726000 and "1586998726000"

Can't really figure out. Help appreciated.

+ works fine for concatenating strings. For the number, just multiply by 1000. — Shivashriganesh Mahato
– Shivashriganesh Mahato, Commented Apr 16, 2020 at 1:04
And in modern JS, use template strings. `${yourval}000`, done. ("modern" with a grain of salt, everything except IE11 has had support for it for years now) — Mike 'Pomax' Kamermans
– Mike 'Pomax' Kamermans, Commented Apr 16, 2020 at 1:07
@Mike'Pomax'Kamermans yeah but one needs output to be number and other needs string i guess by posted output format — Code Maniac
– Code Maniac, Commented Apr 16, 2020 at 1:13
Your epoch value should be a number, wherever you got that string from, you should just immediately cast it to a number at the edges of your system, and never let bad data like this flow through your inner layers. — soote
– soote, Commented Apr 16, 2020 at 1:27

Kevin Languasco · Accepted Answer · 2020-04-16 02:00:12Z

3

If you have

var epochInteger = 1586998726;
var epochString = "1586998726";

You can do:

For the number

epochInteger * 1000 === 1586998726000;

For the string

epochString + "000" === "1586998726000";

To do conversions between them

epochInteger.toString() === epochString;
Number(epochString) === epochInteger;

But note that these conversions work in both cases

epochString.toString() === epochString;
Number(epochInteger) === epochInteger;

So in general you could use something like

var modifiedEpochInteger = Number(epochAnyType) * 1000;
var modifiedEpochString = modifiedEpochInteger.toString();

and you'd get the result in both types, no matter where you started!

answered Apr 16, 2020 at 1:07

Kevin Languasco

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