将元素添加到数组并打印元素

Question

In arrays.js , define two functions, addElementToBeginningOfArray and destructivelyAddElementToBeginningOfArray . Both functions take two parameters, an array and an element to add to the beginning of the array, and both functions should add the element to the beginning of the array and then return the whole array. The destructive function, destructivelyAddElementToBeginningOfArray , should alter the original array that's passed in; addElementToBeginningOfArray , on the other hand, should return a new array and not modify the original.

This is my code, but I need to print the array elements:

destructivelyAddElementToBeginningOfArray(arry, elementN){
    arry.unshift(elementN)
    return arry
}

Answer 1

You can print output a few different ways, I would go with console.log personally for homework code, unless you have a brief on how it should print. This is a fairly basic question, that you probably could have found an answer to on your own if you knew where to look :). I would point you towards MDN for referencing JS, CSS, and HTML. Hope that helps.

destructivelyAddElementToBeginningOfArray(array, elementN){
    array.unshift(elementN)
    return array
}
let result = destructivelyAddElementToBegginingOfArray([1, 2, 3], 4);
// pick one
console.log(result);
document.write(result);
alert(result);

Or if you need to illustrate that you are changing inside the function do something like this.

destructivelyAddElementToBeginningOfArray(array, elementN){
    array.unshift(elementN)
    console.log(array);
    return;
}