It does NOT define a constant array. It defines a constant reference to an array.
Because of this, we can still change the elements of a constant array.
// You can create a constant array:
const cars = ["Saab", "Volvo", "BMW"];
// You can change an element:
cars[0] = "Toyota";
// You can add an element:
cars.push("Audi");
Sample Code
<!DOCTYPE html>
<html>
<body>
<h2>JavaScript const</h2>
<p>Declaring a constant array does NOT make the elements unchangeable:</p>
<p id="demo"></p>
<script>
// Create an Array:
const cars = ["Saab", "Volvo", "BMW"];
// Change an element:
cars[0] = "Toyota";
// Add an element:
cars.push("Audi");
// Display the Array:
document.getElementById("demo").innerHTML = cars;
</script>
</body>
</html>
Output
JavaScript const
Declaring a constant array does NOT make the elements unchangeable:
Toyota,Volvo,BMW,Audi
Browser Support
The const keyword is not supported in Internet Explorer 10 or earlier.
Assigned when Declared
JavaScript const variables must be assigned a value when they are declared.
Meaning: An array declared with const must be initialized when it is declared.
Using const without initializing the array is a syntax error:
Example
This will not work:
const cars;
cars = ["Saab", "Volvo", "BMW"];
Redeclaring Arrays
Redeclaring an array declared with var is allowed anywhere in a program.
var cars = ["Volvo", "BMW"]; // Allowed
var cars = ["Toyota", "BMW"]; // Allowed
cars = ["Volvo", "Saab"]; // Allowed
Related Searches to JavaScript Array Const - JavaScript Const Array
javascript array const can i use const for array in javascript what is const in javascript how do you declare a const array how to change const array in javascript javascript const javascript const array pushing to an array declared as a const javascript const variable with array & objects javascript const array of objects javascript const object why const array can be changed in javascript const function javascript example const array javascript javascript const vs var javascript const function
