Marusya's School Notes

Delete Elements

Since JavaScript arrays are objects, elements can be deleted by using the JavaScript operator delete. Unfortunately, deleting elements leaves undefined holes in the array:

HTML file:	Displayed by browser:
<body> <h4>Original array:</h4> <p id="demo"></p> <hr /> <h4>Status of deleted index in the array:</h4> <button onclick="myFunction()">Try it</button> <p id="demo1"></p> <hr /> <h4>Current elements in the array after deletion:</h4> <button onclick="myElements()">New Array</button> <p id="demo2"></p> <script> var fruits = ["Banana", "Orange", "Apple", "Mango"]; document.getElementById("demo").innerHTML = fruits; function myFunction() { delete fruits[0]; // Delete first element of the array document.getElementById("demo1").innerHTML = fruits[0]; } function myElements() { document.getElementById("demo2").innerHTML = fruits; } </script> </body>	Original array: Status of deleted index in the array: Current elements in the array after deletion:

HTML file:

Displayed by browser:

<body>
<h4>Original array:</h4>
<p id="demo"></p>
<hr />
<h4>Status of deleted index in the array:</h4>
<button onclick="myFunction()">Try it</button>
<p id="demo1"></p>
<hr />
<h4>Current elements in the array after deletion:</h4>
<button onclick="myElements()">New Array</button>
<p id="demo2"></p>
<script>
var fruits = ["Banana", "Orange", "Apple", "Mango"];
document.getElementById("demo").innerHTML = fruits;
function myFunction() {
    delete fruits[0];    // Delete first element of the array
    document.getElementById("demo1").innerHTML = fruits[0];
}
function myElements() {
    document.getElementById("demo2").innerHTML = fruits;
}
</script>
</body>

Original array:

Status of deleted index in the array:

Current elements in the array after deletion:

Using delete on array elements leaves undefined holes in the array. Use pop() or shift() instead.