Created
May 26, 2015 01:52
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| var combinators = require('fantasy-combinators') | |
| var compose = combinators.compose | |
| var identity = combinators.identity | |
| var flip = combinators.flip | |
| var add = function (a) { | |
| return function (b) { | |
| return b + a | |
| } | |
| } | |
| var mul = function (a) { | |
| return function (b) { | |
| return b * a | |
| } | |
| } | |
| var uncurry2 = function (f) { | |
| return function (a, b) { | |
| return f(a)(b) | |
| } | |
| } | |
| var reduce = function (reducer) { | |
| return function (xs) { | |
| return function (initial_val) { | |
| return xs.reduce(uncurry2(reducer), initial_val) | |
| } | |
| } | |
| } | |
| var compose_n = flip (reduce (compose)) (identity) | |
| // f(x) = 2(5x + 3) = mul(2)(add(3)(mul(5)(x))) | |
| var derp = compose_n ([mul(2), add(3), mul(5)]) | |
| // 56 | |
| console.log(derp(5)) |
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