Instructions on how to accept an array as an argument and subsequently provide a duplicate of the original array

function duplicate(originalFlavors) {

var originalFlavors = [
        "Banana Nut Fudge",
        "Black Walnut",
        "Burgundy Cherry",
        "Butterscotch Ribbon",
        "Cherry Macaron",
        "Chocolate",
        "Chocolate Almond",
        "Chocolate Chip",
        "Chocolate Fudge",
        "Chocolate Mint",
        "Chocolate Ribbon",
        "Coffee",
        "Coffee Candy",
        "Date Nut",
        "Eggnog",
        "French Vanilla",
        "Green Mint Stick",
        "Lemon Crisp",
        "Lemon Custard",
        "Lemon Sherbet",
        "Maple Nut",
        "Orange Sherbet",
        "Peach",
        "Peppermint Fudge Ribbon",
        "Peppermint Stick",
        "Pineapple Sherbet",
        "Raspberry Sherbet",
        "Rocky Road",
        "Strawberry",
        "Vanilla",
        "Vanilla Burnt Almond"
    ];


    console.log(duplicate(originalFlavors));
}
javascriptarraysfunctionsyntaxreturn

Answer №1

function duplicateFlavors(flavorList) {
    return [...flavorList];
}  

var flavorList = [
    "Banana Nut Fudge",
    "Black Walnut",
    "Burgundy Cherry",
    "Butterscotch Ribbon",
    "Cherry Macaron",
    "Chocolate",
    "Chocolate Almond",
    "Chocolate Chip",
    "Chocolate Fudge",
    "Chocolate Mint",
    "Chocolate Ribbon",
    "Coffee",
    "Coffee Candy",
    "Date Nut",
    "Eggnog",
    "French Vanilla",
    "Green Mint Stick",
    "Lemon Crisp",
    "Lemon Custard",
    "Lemon Sherbet",
    "Maple Nut",
    "Orange Sherbet",
    "Peach",
    "Peppermint Fudge Ribbon",
    "Peppermint Stick",
    "Pineapple Sherbet",
    "Raspberry Sherbet",
    "Rocky Road",
    "Strawberry",
    "Vanilla",
    "Vanilla Burnt Almond"
];  
console.log(duplicateFlavors(flavorList));

Answer №2

To create a duplicate array without referencing the original one, use the slice method.

function duplicateArray(flavors) {
  return flavors.slice()
}

// Alternatively, using ES6 arrow syntax

const duplicateArray = original => original.slice()

Answer №3

function duplicateArray(input){
  return [...input];
}

This function will create a copy of the array that is passed to it, and you can also use this in a single line.

To learn more about this syntax, check out the Spread operator documentation.

UPDATE: According to @Pawan Sharma's feedback in the comments, the spread operator may be slower than using splice for large arrays.

Here are the latest benchmark results:

https://i.sstatic.net/CCoV4.png

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