Array.injoin()
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Array.injoin(JoinWith)
A string with all array elements joined starting from second element.If separator is an empty string, all elements are joined without any characters in between them.
['air','fire','water','land','sky'].injoin('#')
airfire#water#land#sky
1..10.injoin('!!!!')
12!!!!3!!!!4!!!!5!!!!6!!!!7!!!!8!!!!9!!!!10
30..40.injoin()
3031323334353637383940