Contracts

Contracts tell us how to use a function. For example: ellipse :: (Number, Number, String, String) -> Image tells us that the name of the function is ellipse, it takes four inputs (two Numbers and two Strings), and it evaluates to an Image. From the contract, we know ellipse(50, 100, "solid", "teal") will evaluate to an Image.

Name Domain Range

Name		Domain		Range
`# triangle`	`::`	`Number, String, String`	`->`	`Image`
`triangle(80, "solid", "darkgreen")`
`# star`	`::`		`->`

`# circle`	`::`		`->`

`# square`	`::`		`->`

`# rectangle`	`::`		`->`

`# rhombus`	`::`		`->`

`# ellipse`	`::`		`->`

`# text`	`::`		`->`

`# regular-polygon`	`::`		`->`

`#` `right-triangle`	`::`		`->`

`#` `isosceles-triangle`	`::`		`->`

`# radial-star`	`::`		`->`

`# star-polygon`	`::`		`->`

`# triangle-sas`	`::`		`->`

`#` `triangle-asa`	`::`		`->`

# triangle

::

Number, String, String

->

Image

triangle(80, "solid", "darkgreen")

# star

::

->

# circle

::

->

# square

::

->

# rectangle

::

->

# rhombus

::

->

# ellipse

::

->

# text

::

->

# regular-polygon

::

->

# right-triangle

::

->

# isosceles-triangle

::

->

# radial-star

::

->

# star-polygon

::

->

# triangle-sas

::

->

# triangle-asa

::

->

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