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https://www.w3schools.com/jsref/jsref_obj_array.asp
Using isArray, which is a method that returns a boolean, let's you determine if a variable is an array or not.
let fruits = ["banana", "apple", "pear"];
let fruit = "orange";
document.getElementById("demo").innerHTML = "is fruits an array: " + Array.isArray(fruits).toString();
document.getElementById("demo2").innerHTML = "is fruit an array: " + Array.isArray(fruit).toString();