Curry and partial application in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a curried function that adds two numbers.

Ruby

add = ->(x, y) { x + y }.[1]
add_two = add.call(2)
result = add_two.call(3)
puts result

Drag options to blanks, or click blank then click option'

Alambda

Bpartial

Cbind

Dcurry

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'partial' which is not a Ruby method for currying.

Trying to call 'bind' which is unrelated here.

The curry method transforms a lambda into a curried function, allowing partial application of arguments.

2fill in blank

medium

Complete the code to partially apply the first argument of the curried function.

Ruby

multiply = ->(x, y) { x * y }.curry
double = multiply.[1](2)
puts double.call(5)

Drag options to blanks, or click blank then click option'

Acall

Bcall_partial

Ccall_proc

Attempts:

3 left

💡 Hint

Common Mistakes

Using non-existent methods like 'call_partial' or 'call_proc'.

Confusing method names for calling lambdas.

After currying, you can partially apply arguments by calling the function with fewer arguments.

3fill in blank

hard

Fix the error in the code to correctly curry the lambda.

Ruby

adder = lambda { |x, y| x + y }.[1]
puts adder.call(1).call(2)

Drag options to blanks, or click blank then click option'

Acurrying

Bcurry

Cpartial

Dcurry!

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'currying' which is not a method.

Using 'curry!' which does not exist.

The correct method to curry a lambda is curry. There is no currying or curry! method.

4fill in blank

hard

Fill both blanks to create a curried function and partially apply the first argument.

Ruby

concat = ->(a, b) { a + b }.[1]
hello = concat.[2]('Hello, ')
puts hello.call('World!')

Drag options to blanks, or click blank then click option'

Acurry

Bcall

Dpartial

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'partial' instead of 'curry' for the first blank.

Using 'partial' instead of 'call' for the second blank.

First, use curry to enable currying, then use call to partially apply the first argument.

5fill in blank

hard

Fill all three blanks to create a curried function, partially apply arguments, and call the final function.

Ruby

power = ->(base, exponent) { base ** exponent }.[1]
square = power.[2](2)
cube = power.[3](3)
puts square.call(4)
puts cube.call(3)

Drag options to blanks, or click blank then click option'

Acurry

Bcall

Dpartial

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'partial' instead of 'curry' for the first blank.

Using 'partial' instead of 'call' for the second and third blanks.

Use curry to enable currying, then call to partially apply the base argument for square and cube.