Splitting a string with comma [closed]

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Is there any way to split a string with comma str.split(",") will give same string?

Also var t = str.split("#")

let # be any character, then what is value of t? I know split() returns an array.

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var arr = str.split(",");

This will result in an array. The string representation is the array, joined by a comma (,). To turn this array in a string again, use the array.join(separator) function:

var str = arr.join(",");