splitting a date string by index to string using javascript

Question

Hi I have a few syntax problems as I build a date from a string that looks like

My code :

paramCheckDate = "01/14/2022"

CheckDateYYYYMMDD = paramCheckDate.split["/"][2].toString() + paramCheckDate.split["/"][1].toString() + paramCheckDate.split["/"][0].toString()

I would like to build another string in the format YYYYMMDD. Splitting by index and then .toString but I have syntax errors if I can get some guidance that would be awesome!

String.split is a function, so you should call it with parentheses not brackets. paramCheckDate.split(...) — James
– James, Commented Aug 31, 2022 at 16:35
paramCheckDate.split("/").reverse().join(""); I like to use this instead. It is clean. — Helio
– Helio, Commented Aug 31, 2022 at 16:42
There is another mistake here though, because the source format seems to be M/D/Y and not D/M/Y, so reversing won't yield the desired result. — CherryDT
– CherryDT, Commented Aug 31, 2022 at 16:44

CherryDT · Accepted Answer · 2022-08-31 16:43:14Z

1

You have ['/'] instead of ('/') - String.prototype.split is a function that you have to call, not an array/object that you have to index.
There is no need for toString(), the parts of the strings are already - well - strings.
Your example shows that you want to convert MM/DD/YYYY to YYYYMMDD, however (assuming you fixed #1) you are actually converting it to YYYYDDMM. You'd have to use the third, then the first and then the second part. (I am assuming MM/DD/YYYY as source because there is no 14th month of the year.)
It would be more performant (and easier to read) not to call split 3 times. Instead, you can split it once and then join:

const [m, d, y] = paramCheckDate.split('/')
const CheckDateYYYYMMDD = y + m + d

edited Aug 31, 2022 at 16:43

answered Aug 31, 2022 at 16:37

CherryDT

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Slava Knyazev · Accepted Answer · 2022-08-31 16:35:49Z

0

Square braces are for array access, round braces are for function calls.

Use paramCheckDate.split("/")

answered Aug 31, 2022 at 16:35

Slava Knyazev

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Abdul Munim · Accepted Answer · 2022-08-31 16:41:13Z

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You can use the below Regular Expression to replace your source string to your required format

const CheckDateYYYYMMDD = paramCheckDate.replace(/(\d+)\/(\d+)\/(\d+)/,"$3$1$2");

answered Aug 31, 2022 at 16:41

Abdul Munim

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1 Comment

CherryDT Over a year ago

While this works, it is hard to read and unnecessarily slow (approx. 6x slower than splitting once and then concatenating), so I think with this we would be teaching a bad habit here...

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