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Add converge (Phoenix) to combinators. (#333)
* Add `converge` (Phoenix) to combinators. * Update combinator names for `converge` * Update `converge` test example usage * Get famous * Move `converge` to the correct `combinators` directory and expose * Add `combinators/converge` to the appropriate docs pages * Add pirates to `converge` docs * Add `converge` to `combinators` search terms * Update helper paths, error message, license date, error checks * Remove dep destructuring and add signatures to `converge` example code * Give `converge` example some room to breathe * Reflect unknown type of `Maybe` in example fn results
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,17 @@ | ||
| /** @license ISC License (c) copyright 2018 original and current authors */ | ||
| /** @author Matt Ross (amsross) */ | ||
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| const curry = require('../core/curry') | ||
| const isFunction = require('../core/isFunction') | ||
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| // converge (Phoenix or Starling Prime) | ||
| // (b -> c -> d) -> (a -> b) -> (a -> c) -> a -> d | ||
| function converge(f, g, h, x) { | ||
| if(!isFunction(f) || !isFunction(g) || !isFunction(h)) { | ||
| throw new TypeError('converge: Functions required for first three arguments') | ||
| } | ||
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| return curry(f)(g(x), h(x)) | ||
| } | ||
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| module.exports = curry(converge) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,57 @@ | ||
| const test = require('tape') | ||
| const helpers = require('../test/helpers') | ||
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| const bindFunc = helpers.bindFunc | ||
| const isFunction = require('../core/isFunction') | ||
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| const sub = require('./converge') | ||
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| test('converge (Big Phi or S\' combinator)', t => { | ||
| const s = bindFunc(sub) | ||
| const x = 67 | ||
| const f = x => y => x + y | ||
| const g = x => x - 1 | ||
| const h = x => x + 1 | ||
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| t.ok(isFunction(sub), 'is a function') | ||
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| const err = /converge: Functions required for first three arguments/ | ||
| t.throws(s(undefined, g, h, x), err, 'throws with first arg undefined') | ||
| t.throws(s(null, g, h, x), err, 'throws with first arg null') | ||
| t.throws(s(0, g, h, x), err, 'throws with first arg falsey number') | ||
| t.throws(s(1, g, h, x), err, 'throws with first arg truthy number') | ||
| t.throws(s('', g, h, x), err, 'throws with first arg falsey string') | ||
| t.throws(s('string', g, h, x), err, 'throws with first arg truthy string') | ||
| t.throws(s(false, g, h, x), err, 'throws with first arg false') | ||
| t.throws(s(true, g, h, x), err, 'throws with first arg true') | ||
| t.throws(s({}, g, h, x), err, 'throws with first arg an object') | ||
| t.throws(s([], g, h, x), err, 'throws with first arg an array') | ||
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| t.throws(s(f, undefined, h, x), err, 'throws with second arg undefined') | ||
| t.throws(s(f, null, h, x), err, 'throws with second arg null') | ||
| t.throws(s(f, 0, h, x), err, 'throws with second arg falsey number') | ||
| t.throws(s(f, 1, h, x), err, 'throws with second arg truthy number') | ||
| t.throws(s(f, '', h, x), err, 'throws with second arg falsey string') | ||
| t.throws(s(f, 'bling', h, x), err, 'throws with second arg truthy string') | ||
| t.throws(s(f, false, h, x), err, 'throws with second arg false') | ||
| t.throws(s(f, true, h, x), err, 'throws with second arg true') | ||
| t.throws(s(f, {}, h, x), err, 'throws with second arg an object') | ||
| t.throws(s(f, [], h, x), err, 'throws with second arg an array') | ||
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| t.throws(s(f, g, undefined, x), err, 'throws with third arg undefined') | ||
| t.throws(s(f, g, null, x), err, 'throws with third arg null') | ||
| t.throws(s(f, g, 0, x), err, 'throws with third arg falsey number') | ||
| t.throws(s(f, g, 1, x), err, 'throws with third arg truthy number') | ||
| t.throws(s(f, g, '', x), err, 'throws with third arg falsey string') | ||
| t.throws(s(f, g, 'string', x), err, 'throws with third arg truthy string') | ||
| t.throws(s(f, g, false, x), err, 'throws with third arg false') | ||
| t.throws(s(f, g, true, x), err, 'throws with third arg true') | ||
| t.throws(s(f, g, {}, x), err, 'throws with third arg an object') | ||
| t.throws(s(f, g, [], x), err, 'throws with third arg an array') | ||
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| const result = sub(f, g, h, x) | ||
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| t.equal(result, 134, 'returns expected result') | ||
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| t.end() | ||
| }) |
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