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January 4, 2017 05:05
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esnextbin sketch
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| <!doctype html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>ESNextbin Sketch</title> | |
| <!-- put additional styles and scripts here --> | |
| </head> | |
| <body> | |
| <!-- put markup and other contents here --> | |
| </body> | |
| </html> |
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| // Try out by visiting: https://esnextb.in/?gist=e98c7a5295d3e940114ee87b7c273fe2 | |
| /* | |
| * Recursively flattens each item in the array. | |
| */ | |
| function flatten(array) { | |
| if (array.length === 0) return array; | |
| const [head, ...tail] = array; | |
| if (Array.isArray(head)) return flatten(head).concat(flatten(tail)); | |
| // If the head is a single item, it just becomes the head of the result. | |
| return [head].concat(flatten(tail)); | |
| } | |
| // TESTS | |
| import test from 'tape'; | |
| import tapeDom from 'tape-dom' | |
| // Show results in the DOM; | |
| tapeDom(test); | |
| test('empty array', function (t) { | |
| t.deepEqual( | |
| [], | |
| flatten([]), | |
| 'an empty array should equal a flattened empty array', | |
| ); | |
| t.end(); | |
| }); | |
| test('already flat array', function (t) { | |
| t.deepEqual( | |
| flatten([1, 2, 3]), | |
| [1, 2, 3], | |
| 'a flat array should be the same after being flattened', | |
| ); | |
| t.end(); | |
| }); | |
| test('nested array', function (t) { | |
| t.deepEqual( | |
| flatten([[[1], [[2, [3]]], 4, [[[5]]]]]), | |
| [1, 2, 3, 4, 5], | |
| 'a nested array should be flattened', | |
| ); | |
| t.end(); | |
| }); |
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| { | |
| "name": "esnextbin-sketch", | |
| "version": "0.0.0", | |
| "dependencies": { | |
| "tape": "4.6.3", | |
| "tape-dom": "0.0.12", | |
| "babel-runtime": "6.20.0" | |
| } | |
| } |
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| 'use strict'; | |
| var _toArray2 = require('babel-runtime/helpers/toArray'); | |
| var _toArray3 = _interopRequireDefault(_toArray2); | |
| var _tape = require('tape'); | |
| var _tape2 = _interopRequireDefault(_tape); | |
| var _tapeDom = require('tape-dom'); | |
| var _tapeDom2 = _interopRequireDefault(_tapeDom); | |
| function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; } | |
| // Try out by visiting: https://esnextb.in/?gist=e98c7a5295d3e940114ee87b7c273fe2 | |
| /* | |
| * Recursively flattens each item in the array. | |
| */ | |
| function flatten(array) { | |
| if (array.length === 0) return array; | |
| var _array = (0, _toArray3.default)(array); | |
| var head = _array[0]; | |
| var tail = _array.slice(1); | |
| if (Array.isArray(head)) return flatten(head).concat(flatten(tail)); | |
| // If the head is a single item, it just becomes the head of the result. | |
| return [head].concat(flatten(tail)); | |
| } | |
| // TESTS | |
| // Show results in the DOM; | |
| (0, _tapeDom2.default)(_tape2.default); | |
| (0, _tape2.default)('empty array', function (t) { | |
| t.deepEqual([], flatten([]), 'an empty array should equal a flattened empty array'); | |
| t.end(); | |
| }); | |
| (0, _tape2.default)('already flat array', function (t) { | |
| t.deepEqual(flatten([1, 2, 3]), [1, 2, 3], 'a flat array should be the same after being flattened'); | |
| t.end(); | |
| }); | |
| (0, _tape2.default)('nested array', function (t) { | |
| t.deepEqual(flatten([[[1], [[2, [3]]], 4, [[[5]]]]]), [1, 2, 3, 4, 5], 'a nested array should be flattened'); | |
| t.end(); | |
| }); |
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