JS: Array.prototype.toString

arrayX.toString()

Return a string representation of arrayX.

[3, 4].toString() === "3,4"
// note: no bracket in result

[[1, [2]], 5].toString() === "1,2,5"
// note: no bracket in result, even for nested array

[3, { k: 4 }].toString() === "3,[object Object]"