Instructions

In this exercise, you've been tasked with writing the software for an encryption device that works by performing transformations on data. You need a way to flexibly create complicated functions by combining simpler functions together.

For each task, return a block that can be invoked from the calling scope.

1. Create an adder

Implement secret-add. It should return a function which takes one argument and adds to it the argument passed in to secret-add.

2. Create a subtractor

Implement secret-subtract. It should return a function which takes one argument and subtracts the secret passed in to secret-subtract from that argument.

3. Create a multiplier

Implement secret-multiply. It should return a function which takes one argument and multiplies it by the secret passed in to secret-multiply.

4. Create a divider

Implement secret-divide. It should return a function which takes one argument and divides it by the secret passed in to secret-divide.

5. Create a function combiner

Implement secret-combine. It should return a function which takes one argument and applies to it the two functions passed in to secret-combine in order.