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Add tupleToArray point free function (#354)
* add tuple to array and spec
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,30 @@ | ||
| /** @license ISC License (c) copyright 2018 original and current authors */ | ||
| /** @author Jasmina Jacquelina (jasminabasurita) */ | ||
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| const curry = require('../core/curry') | ||
| const isFunction = require('../core/isFunction') | ||
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| // tupleToArray : Tuple a -> [ a ] | ||
| // tupleToArray : (a -> Tuple b) -> a -> [ b ] | ||
| function tupleToArray(tuple) { | ||
| if(isFunction(tuple)) { | ||
| return function(x) { | ||
| const m = tuple(x) | ||
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| if(!isFunction(m.tupleLength)) { | ||
| throw new TypeError('tupleToArray: Tuple returning function required') | ||
| } | ||
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| return m.toArray() | ||
| } | ||
| } | ||
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| if(isFunction(tuple.tupleLength)) { | ||
| return tuple.toArray() | ||
| } | ||
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| throw new TypeError('tupleToArray: Tuple or Tuple returning function required') | ||
| } | ||
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| module.exports = curry(tupleToArray) | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,125 @@ | ||
| const test = require('tape') | ||
| const helpers = require('../test/helpers') | ||
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| const bindFunc = helpers.bindFunc | ||
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| const Tuple = require('.') | ||
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| const List = require('../core/List') | ||
| const isArray = require('../core/isArray') | ||
| const isFunction = require('../core/isFunction') | ||
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| const identity = x => x | ||
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| const tupleToArray = require('./tupleToArray') | ||
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| test('tupleToArray transform', t => { | ||
| const f = bindFunc(tupleToArray) | ||
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| t.ok(isFunction(tupleToArray), 'is a function') | ||
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| t.throws(f(undefined), TypeError, 'throws if arg is undefined') | ||
| t.throws(f(null), TypeError, 'throws if arg is null') | ||
| t.throws(f(0), TypeError, 'throws if arg is a falsey number') | ||
| t.throws(f(1), TypeError, 'throws if arg is a truthy number') | ||
| t.throws(f(''), TypeError, 'throws if arg is a falsey string') | ||
| t.throws(f('string'), TypeError, 'throws if arg is a truthy string') | ||
| t.throws(f(false), TypeError, 'throws if arg is false') | ||
| t.throws(f(true), TypeError, 'throws if arg is true') | ||
| t.throws(f({}), TypeError, 'throws if arg is an object') | ||
| t.throws(f(List.fromArray([ 1,2,3 ])), TypeError, 'throws if arg is a different crock') | ||
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| t.end() | ||
| }) | ||
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| test('tupleToArray with 3-Tuple', t => { | ||
| const data = [ 24, { triple: 'tuple' }, '56' ] | ||
| const Triple = Tuple(3) | ||
| const triple = Triple(...data) | ||
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| const a = tupleToArray(triple) | ||
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| t.ok(isArray(a), 'returns an Array from Tuple') | ||
| t.same(a, data, 'preserves the structure of underlying data') | ||
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| t.end() | ||
| }) | ||
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| test('tupleToArray with 4-Tuple', t => { | ||
| const data = [ 24, { triple: 'tuple' }, '56', [ 1 ] ] | ||
| const Tuple4 = Tuple(4) | ||
| const tuple = Tuple4(...data) | ||
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| const a = tupleToArray(tuple) | ||
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| t.ok(isArray(a), 'returns an Array from Tuple') | ||
| t.same(a, data, 'preserves the structure of underlying data') | ||
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| t.end() | ||
| }) | ||
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| test('tupleToArray with 5-Tuple', t => { | ||
| const data = [ 25, { triple: 'tuple' }, '56', [ 1 ], 80 ] | ||
| const Tuple5 = Tuple(5) | ||
| const tuple = Tuple5(...data) | ||
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| const a = tupleToArray(tuple) | ||
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| t.ok(isArray(a), 'returns an Array from Tuple') | ||
| t.same(a, data, 'preserves the structure of underlying data') | ||
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| t.end() | ||
| }) | ||
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| test('tupleToArray with 6-Tuple', t => { | ||
| const data = [ 25, { triple: 'tuple' }, '66', [ 1 ], 80, 2 ] | ||
| const Tuple6 = Tuple(6) | ||
| const tuple = Tuple6(...data) | ||
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| const a = tupleToArray(tuple) | ||
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| t.ok(isArray(a), 'returns an Array from Tuple') | ||
| t.same(a, data, 'preserves the structure of underlying data') | ||
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| t.end() | ||
| }) | ||
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| test('tupleToArray with 7-Tuple', t => { | ||
| const data = [ 25, { triple: 'tuple' }, '77', [ 1 ], 80, 2, 3 ] | ||
| const Tuple7 = Tuple(7) | ||
| const tuple = Tuple7(...data) | ||
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| const a = tupleToArray(tuple) | ||
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| t.ok(isArray(a), 'returns an Array from Tuple') | ||
| t.same(a, data, 'preserves the structure of underlying data') | ||
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| t.end() | ||
| }) | ||
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| test('tupleToArray with Tuple returning function', t => { | ||
| const f = bindFunc(tupleToArray(identity)) | ||
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| t.throws(f(undefined), TypeError, 'throws if function returns undefined') | ||
| t.throws(f(null), TypeError, 'throws if function returns null') | ||
| t.throws(f(0), TypeError, 'throws if function returns a falsey number') | ||
| t.throws(f(1), TypeError, 'throws if function returns a truthy number') | ||
| t.throws(f(''), TypeError, 'throws if function returns a falsey string') | ||
| t.throws(f('string'), TypeError, 'throws if function returns a truthy string') | ||
| t.throws(f(false), TypeError, 'throws if function returns false') | ||
| t.throws(f(true), TypeError, 'throws if function returns true') | ||
| t.throws(f({}), TypeError, 'throws if function returns an object') | ||
| t.throws(f([]), TypeError, 'throws if function returns an array') | ||
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| const data = [ 24, { triple: 'tuple' }, '56' ] | ||
| const Triple = Tuple(3) | ||
| const triple = Triple(...data) | ||
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| const m = tupleToArray(identity, triple) | ||
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| t.ok(isArray(m), 'returns an Array from a function returning a Tuple') | ||
| t.same(m, data, 'preserves the structure of underlying data') | ||
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| t.end() | ||
| }) | ||
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