Contracts

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

Name Domain Range

Name		Domain		Range
`;` `triangle`	`::`	`Number, String, Sting`	`->`	`Image`
`(triangle 80 "solid" "green")`
`;` `star`	`::`		`->`

`;` `circle`	`::`		`->`

`;` `square`	`::`		`->`

`;` `rectangle`	`::`		`->`

`;` `text`	`::`		`->`

`;` `ellipse`	`::`		`->`

`;` `regular-polygon`	`::`		`->`

`;` `rhombus`	`::`		`->`

`;` `right-triangle`	`::`		`->`

`;` `isosceles-triangle`	`::`		`->`

`;` `radial-star`	`::`		`->`

`;` `star-polygon`	`::`		`->`

`;` `triangle/sas`	`::`		`->`

`;` `triangle/asa`	`::`		`->`

; triangle

::

Number, String, Sting

->

Image

(triangle 80 "solid" "green")

; star

::

->

; circle

::

->

; square

::

->

; rectangle

::

->

; text

::

->

; ellipse

::

->

; regular-polygon

::

->

; rhombus

::

->

; right-triangle

::

->

; isosceles-triangle

::

->

; radial-star

::

->

; star-polygon

::

->

; triangle/sas

::

->

; triangle/asa

::

->

These materials were developed partly through support of the National Science Foundation, (awards 1042210, 1535276, 1648684, and 1738598). Bootstrap by the Bootstrap Community is licensed under a Creative Commons 4.0 Unported License. This license does not grant permission to run training or professional development. Offering training or professional development with materials substantially derived from Bootstrap must be approved in writing by a Bootstrap Director. Permissions beyond the scope of this license, such as to run training, may be available by contacting contact@BootstrapWorld.org.