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what is const in js
In JavaScript, const is a keyword used to declare a variable that cannot be reassigned once it has been assigned a value. It is used to define constants, which are values that do not change throughout the program. Here's an example:
javascript Copy code
const PI = 3.14159;
console.log(PI); // Output: 3.14159
PI = 3.14; // Error: Assignment to constant variable
In the example above, PI is declared as a constant with the value of 3.14159. Any attempt to reassign a new value to PI will result in an error, as shown in the second line.
why are we using let and not const?
In programming, let and const are both used to declare variables.
The main difference between them is that let allows the variable to be reassigned multiple times, while const creates a variable that cannot be reassigned after it has been assigned a value.
We use let when we know that the value of the variable may change over time. For example, when we are working with a variable inside a loop, or when we want to update the value of a variable based on user input.
On the other hand, we use const when we want to create a variable that should not be reassigned. This can help prevent accidental changes to a variable and make our code more robust.
It's important to choose between let and const based on the requirements of your code. If you are unsure which one to use, you can use let by default, and if you realize that the value should not be changed, you can switch to const.
Here's an example in JavaScript:
javascript Copy code
let x = 5;
x = 10; // We can reassign the value of x using let
const y = 5;
y = 10; // This will give an error, because we cannot reassign a constant variable
Remember, it's always good practice to use const whenever possible, as it makes your code more predictable and less prone to bugs.
what does const do in java script
In JavaScript, the const keyword is used to declare a variable that cannot be reassigned after it has been initialized. It is used to declare a constant value. The value assigned to a const variable cannot be changed throughout the program. Here's an example:
javascript Copy code
const pi = 3.1416;
console.log(pi); // Output: 3.1416
pi = 3.14; // This will give an error because pi is a constant and cannot be reassigned
console.log(pi);
You can find more information and examples about const in JavaScript in the following link: JavaScript const
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Not likely. AI can automate tasks and make developers' jobs more efficient but it can't fully replace the human ability to deal with complex software. And AI will still require human developers to supervise and improve it further.
So developers may see their tasks change but they won't be replaced by AI. 👩💻🤝💻