Kaleidoscope programming language is a historical programming language created in 1994. The Kaleidoscope programming language is a constraint programming language embedding constraints into an imperative object-oriented language. It adds keywords always, once, and assert..during (formerly while..assert) to make statements about relational invariants. Objects have constraint constructors, which are not methods, to enforce the meanings of user-defined datatypes. Read more on Wikipedia...

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Example code from Wikipedia:

always: temperature = mercury.height / scale;
always: white rectangle( thermometer );
always: grey rectangle( mercury );
always: display number( temperature );
while mouse.button = down do
 mercury.top = mouse.location.y;
end while;

Last updated October 20th, 2019