How do I use default parameters in arrow functions?

How do I use default parameters in arrow functions?

You can set default parameters in arrow functions by assigning a value to the parameter in the function definition. For example: const add = (a = 1, b = 2) => a + b; This means if you call add() without arguments, it will return 3.

Can you give me another example?

Sure! Here's another example: const greet = (name = 'Guest') => Hello, ${name}!; If you call greet()it will return 'Hello, Guest!'. You can also pass a name likegreet('Alice')` to get 'Hello, Alice!'.

What happens if I pass undefined as an argument?

If you pass undefined as an argument, the default parameter will still be used. For example, greet(undefined) will return 'Hello, Guest!'. This is because undefined does not override the default value.

Are there any limitations to using default parameters?

One limitation is that default parameters are evaluated at call time, so if you use an expression that relies on other parameters, it may not behave as expected. Also, default parameters cannot be used in conjunction with rest parameters in the same position.