arrayShiftExplanation.js

let theArray = [5, 9, 3, 15, 41, 2, 19];

function arrayShift(arr, idx) {
        console.log("Starting array is");
        console.log(theArray);
        for (let i=idx; i<arr.length - 1; ++i) {
                console.log("Step");
                theArray[i] = theArray[i + 1];
                console.log(theArray);
        }
        theArray.pop();
        console.log("Done, result was")
        console.log(theArray);
}

// int main(void) { ...
console.log("Will remove 15");
arrayShift(theArray, theArray.indexOf(15));
console.log("Will remove 9");
arrayShift(theArray, theArray.indexOf(9));