My handler function looks like this:
handleSelect = (k0, k1, v) => {
...
}
};
I am looking for a way to make the k1 parameter optional in this function. Is there a recommended approach to achieve this?
My handler function looks like this:
handleSelect = (k0, k1, v) => {
...
}
};
I am looking for a way to make the k1 parameter optional in this function. Is there a recommended approach to achieve this?
Dealing with variadic functions and optional parameters can be tricky, regardless of the programming language or syntax used.
One approach is to handle the arguments by parsing them within the function:
processData = (...args) => {
let key1, key2, value;
if (args.length > 2) {
[key1, key2, value] = args;
} else {
[key1, value] = args;
key2 = 'default';
}
...
};
However, this method may lead to a less intuitive API design. A more effective way to tackle functions with multiple parameters, some of which are optional, is to utilize an object for passing options. This eliminates the need to worry about parameter order:
processData = ({ key1, key2 = 'default', value }) => {
...
};
A new feature allows for default assignment in a more intuitive way:
handleSelect = (k0, k1 = null, v = null) => {
The documentation lacks clarity on this topic, but after testing, I can confirm that it works across all major browsers: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Default_parameters
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