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Showing content from https://webplatform.github.io/docs/javascript/Array/join below:

join Summary

Adds all the elements of an array separated by the specified separator string.

Syntax

join([ separator ])

separator: Optional. A string used to separate one element of an array from the next in the resulting String. If omitted, the array elements are separated with a comma.

Examples

The following example illustrates the use of the join method.

var a, b;
 a = new Array(0,1,2,3,4);
 b = a.join( "-" ) ;
 document.write(b);

Remarks

If any element of the array is undefined or null , it is treated as an empty string.