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# AI solution for JavaScript Coding Question on BFE.dev

1. implement curry()

Here is a possible implementation of the `curry()`

function in JavaScript:

```
const curry = (fn) => {
const arity = fn.length;
return function curried(...args) {
if (args.length >= arity) {
return fn.apply(this, args);
} else {
return function (...moreArgs) {
return curried.apply(this, args.concat(moreArgs));
};
}
};
};
```

Let's break it down:

- The
`curry()`

function takes a function`fn`

as its argument. - It defines a variable
`arity`

that stores the expected number of arguments of`fn`

. - It returns an anonymous function that will be the curried version of
`fn`

. - This anonymous function takes any number of arguments via the rest parameter
`...args`

. - If the number of arguments passed is greater than or equal to
`arity`

, it means that we have all the parameters we need to call`fn`

, so we call it with`fn.apply(this, args)`

and return the result. - If the number of arguments passed is less than
`arity`

, we return another anonymous function that takes any number of additional arguments via the rest parameter`...moreArgs`

, and calls`curried()`

recursively with the concatenation of`args`

and`moreArgs`

.

This implementation allows for partial application, meaning that we can call the curried function with some parameters, and get a new function that expects the remaining parameters. This can be useful for creating new functions from existing ones that have some parameters pre-filled.