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

toString Summary

Returns a string representation of an array.

Syntax

toString()

Return Value

The string representation of the array.

Examples

The following example illustrates the use of the toString method with an array.

var arr = [1, 2, 3, 4];
 var s = arr.toString();
 document.write(s);

Remarks

The elements of an Array are converted to strings. The resulting strings are concatenated and separated by commas.