Which keyword is used to declare variables in JavaScript that cannot be reassigned?
Question
Which keyword is used to declare variables in JavaScript that cannot be reassigned?
Solution
In JavaScript, the keyword used to declare variables that cannot be reassigned is const. When you declare a variable using const, it is a constant reference and its value cannot be changed through reassignment. However, it's important to note that if the value is an object or an array, the contents of that object or array can still be modified. Here's an example:
const myNumber = 5;
// myNumber = 10; // This will throw an error because reassignment is not allowed.
const myArray = [1, 2, 3];
myArray.push(4); // This is allowed, as we are modifying the contents of the array.
Overall, const ensures that the variable's identifier cannot be reassigned, thus maintaining the intended value throughout the code.
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