const alpha = ['a', 'b', 'c'];
const numeric = [1, 2, 3];
let alphaNumeric = alpha.concat(numeric);
console.log(alphaNumeric);
// expected output: Array ["a", "b", "c", 1, 2, 3]
numeric[Symbol.isConcatSpreadable] = false;
alphaNumeric = alpha.concat(numeric);
console.log(alphaNumeric);
// expected output: Array ["a", "b", "c", Array [1, 2, 3]]
const alpha = ['a', 'b', 'c'];const numeric = [1, 2, 3];let alphaNumeric = alpha.concat(numeric);console.log(alphaNumeric);// expected output: Array ["a", "b", "c", 1, 2, 3]numeric[Symbol.isConcatSpreadable] = false;alphaNumeric = alpha.concat(numeric);console.log(alphaNumeric);// expected output: Array ["a", "b", "c", Array [1, 2, 3]]