Combining a string-based array in JavaScript

I need to remove an item from a string indexed array.

Take a look at this sample code:

    var arr = new Array();       
    arr[0] = "Zero";
    arr[1] = "One";
    arr[2] = "Two";
    arr.splice(1, 1);

    for (var index in arr)
        document.writeln(arr[index] + " ");

    //The output will be: Zero Two

    var arr = new Array();
    arr["Zero"] = "Zero";
    arr["One"] = "One";
    arr["Two"] = "Two";

    arr.splice("One", 1); // This won't work
    arr.splice(1, 1); // Nor will this

    for (var index in arr)
        document.writeln(arr[index] + " ");

    //The result will be: Zero One Two

How can I remove "One" from the second example just like in the first example?

Answer №1

When tackling this task, it's important to utilize an object instead of an array:

var items = {};
items['Apple'] = 'Apple';
items['Banana'] = 'Banana';
items['Cherry'] = 'Cherry';
console.log(items); //  Object Apple=Apple Banana=Banana Cherry=Cherry
delete items['Banana'];
console.log(items); //  Object Apple=Apple Cherry=Cherry

Answer №2

When an Array contains string keys (or non-sequential numbers), it transforms into an Object.

Unlike an Array, an Object does not have the splice method. Instead, you need to create your own by creating a new object and manually copying the keys you wish to retain.

One thing to keep in mind is that the order of keys in an object may not always match the order in which they were added. This ordering can vary depending on the specific web browser being used.

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