Function

Background

Given a file named “pen.json” with:

{
  "type": "library",
  "dependencies": {}
}

Define a function

Given a file named “Foo.pen” with:

f = \(x number) number {
  x
}

When I run pen build

Then the exit status should be 0.

Call a function with no argument

Given a file named “Foo.pen” with:

f = \() number {
  f()
}

When I run pen build

Then the exit status should be 0.

Call a function with an argument

Given a file named “Foo.pen” with:

f = \(x number) number {
  f(x)
}

When I run pen build

Then the exit status should be 0.

Call a function with two arguments

Given a file named “Foo.pen” with:

f = \(x number, y number) number {
  f(x, y)
}

When I run pen build

Then the exit status should be 0.

Define a closure

Given a file named “Foo.pen” with:

f = \(x number) \(number) number {
  \(y number) number {
    x + y
  }
}

When I run pen build

Then the exit status should be 0.