I have a string for example '12:13:45.123 UTC Sun Oct 17 2021' and I am looking to change the string into 'Sun Oct 17 2021 12:13:45.123 UTC'.

I do it with

str.slice(18) ' ' str.slice(0,17)

.

but the question is - how can I avoid call slice twice? is there a way to make it more elegant way and efficient?

BTW - I am not looking to split and concat the substrings.

CodePudding user response：

You can use replace with a regex:

const str = '12:13:45.123 UTC Sun Oct 17 2021';

console.log(str.replace(/(.{16}) (.*)/, '$2 $1'));

<iframe name="sif1" sandbox="allow-forms allow-modals allow-scripts" frameborder="0"></iframe>

IMHO it's more elegant but according to https://jsbench.me/ your code is faster.