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https://www.w3schools.com/jsref/jsref_obj_array.asp
Shifting is equivalent to popping, working on the first element instead of the last. The shift() method removes the first array element and "shifts" all other elements to a lower index. It DOES reassign new indexes.
let fruits = ["Banana", "Orange", "Apple", "Mango"];
document.getElementById("before").innerHTML = fruits.join("-");
fruits.shift();
document.getElementById("after").innerHTML = fruits.join("-");
let output = "";
for (var i = 0; i < fruits.length; i++) { output +="The index is " + i + "<br />" ; }
document.getElementById("demo2").innerHTML=output;