mirror of https://github.com/osmarks/website
48 lines
2.3 KiB
HTML
48 lines
2.3 KiB
HTML
---
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title: RPNCalc v4
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slug: rpncalc4
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description: Reverse Polish Notation calculator, version 4 - increasingly esoteric and incomprehensible. Contributed by Aidan.
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---
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<style>
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textarea {
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width: 100%;
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height: 30%;
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}
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code {
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background-color:rgb(230, 230, 230);
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padding: 0 0.125rem;
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}
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</style>
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<textarea id="inbox"></textarea>
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<button id="step">step</button>
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<button id="play">play</button>
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<button id="load">load</button>
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<input type="checkbox" id="use-std" name="use-std" checked>
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<label for="use-std">use stdlib?</label>
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<pre id="insbox"></pre>
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<pre id="outbox"></pre>
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<script src="./main.js" type="module"></script>
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<h3>documentation</h3>
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<p>use <code>(name; value)</code> to define something. the definition can be recursive. <code>value</code> is executed and <code>name</code> is set to the final state of the stack, i.e. <code>(name; 1 3)</code> is possible</p>
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<p>use <code>'</code> to push instead of apply to the stack, e.g. <code>'(a -> a)</code>. This is useful for lazyness, i.e. <code>'(->lazy evaluated thing)</code></p>
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<ul>
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<li><code>+, -, *, /, ^, sqrt</code>: mathematical operations</li>
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<li><code>==</code>: equality (automatically derived for all types); returns <code>a b -> a</code> if true, <code>a b -> b</code> if false</li>
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<li><code>typeof</code>: returns the type of the object</li>
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<li><code>pair, fst, snd</code>: pairs two objects, gets first or second item of pair</li>
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<li><code>tuple</code>: used like <code>... 3 tuple</code>; creates an n tuple of n items on the stack</li>
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<li><code>!!</code>: index into a tuple</li>
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<li><code>len</code>: length of a tuple</li>
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</ul>
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<h3>stdlib</h3>
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<ul>
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<li><code>stop; "stop</code></li>
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<li><code>inv; x -> 1 x /</code></li>
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<li><code>fold; x acc fn -> acc '(-> x acc fn 'fn fold) 'x \"stop ==</code></li>
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<li><code>range; x y -> x '(->x x 1 + y range) 'x y ==</code></li>
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<li><code>listthen; fn -> (internal; x acc -> '(->acc fn) '(->x acc pair internal) x stop ==) 0 tuple internal</code></li>
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<li><code>list; (a -> a) listthen</code></li>
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<li><code>lmap; list fn -> list '(->list fst fn list snd 'fn lmap pair) list 0 tuple ==</code></li>
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<li><code>unlist; l -> (internal; list -> '(->) '(->list fst list snd internal) list 0 tuple ==) stop l internal</code></li>
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<li><code>map; fn -> '(l->l 'fn lmap unlist) listthen</code></li>
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</ul> |