toString() method returns a string representing the
specified array and its elements.
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A string representing the elements of the array.
toString method automatically when an array is to be
represented as a text value or when an array is referred to in a string concatenation.
toString() method is generic and can be used with any
Object.prototype.toString() will be called, and the resulting
value will be returned.
const array1 = [1, 2, 'a', '1a']; console.log(array1.toString()); // expected output: "1,2,a,1a"
The definition of 'Array.prototype.toString' in that specification.
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