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3 different form of fixed point combinators
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| // Y is the fixed point combinator. w1, w2, w3 are its building block. | |
| // one level deep | |
| var w1 = f => n => f( w1(f) )(n) | |
| var Y = w1 | |
| // two level deep | |
| var w2 = g => f => n => f( g(g)(f) )(n) | |
| var Y = w2(w2) | |
| // three level | |
| var w3 = g => h => f => n => f( g(h)(g)(f) )(n) // g, h can be in arbitrary order | |
| var Y = w3(w3)(w3) |
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