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><pid="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.
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