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| 1 <!DOCTYPE html> | 1 <!DOCTYPE html> |
| 2 <!-- | 2 <!-- |
| 3 Copyright (c) 2014 The Chromium Authors. All rights reserved. | 3 Copyright (c) 2014 The Chromium Authors. All rights reserved. |
| 4 Use of this source code is governed by a BSD-style license that can be | 4 Use of this source code is governed by a BSD-style license that can be |
| 5 found in the LICENSE file. | 5 found in the LICENSE file. |
| 6 --> | 6 --> |
| 7 | 7 |
| 8 <link rel="import" href="/tracing/base/base.html"> | 8 <link rel="import" href="/tracing/base/base.html"> |
| 9 | 9 |
| 10 <script> | 10 <script> |
| 11 'use strict'; | 11 'use strict'; |
| 12 | 12 |
| 13 tr.exportTo('tr.b', function() { | 13 tr.exportTo('tr.b', function() { |
| 14 /** | 14 /** |
| 15 * Converts any object which is either (a) an iterable, or (b) an | |
| 16 * "array-ish" object (has length property and can be indexed into) | |
| 17 * into an array. | |
| 18 */ | |
| 19 function asArray(x) { | |
| 20 const values = []; | |
| 21 if (x[Symbol.iterator]) { | |
| 22 for (const value of x) { | |
| 23 values.push(value); | |
| 24 } | |
| 25 } else { | |
| 26 for (let i = 0; i < x.length; i++) { | |
| 27 values.push(x[i]); | |
| 28 } | |
| 29 } | |
| 30 return values; | |
| 31 } | |
| 32 | |
| 33 /** | |
| 34 * Returns the only element in the iterable. If the iterable is empty or has | 15 * Returns the only element in the iterable. If the iterable is empty or has |
| 35 * more than one element, an error is thrown. | 16 * more than one element, an error is thrown. |
| 36 */ | 17 */ |
| 37 function getOnlyElement(iterable) { | 18 function getOnlyElement(iterable) { |
| 38 const iterator = iterable[Symbol.iterator](); | 19 const iterator = iterable[Symbol.iterator](); |
| 39 | 20 |
| 40 const firstIteration = iterator.next(); | 21 const firstIteration = iterator.next(); |
| 41 if (firstIteration.done) { | 22 if (firstIteration.done) { |
| 42 throw new Error('getOnlyElement was passed an empty iterable.'); | 23 throw new Error('getOnlyElement was passed an empty iterable.'); |
| 43 } | 24 } |
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| 336 if (!(a instanceof Set) || !(b instanceof Set)) return false; | 317 if (!(a instanceof Set) || !(b instanceof Set)) return false; |
| 337 if (a.size !== b.size) return false; | 318 if (a.size !== b.size) return false; |
| 338 // Avoid Array.from() here -- it creates garbage. | 319 // Avoid Array.from() here -- it creates garbage. |
| 339 for (const x of a) { | 320 for (const x of a) { |
| 340 if (!b.has(x)) return false; | 321 if (!b.has(x)) return false; |
| 341 } | 322 } |
| 342 return true; | 323 return true; |
| 343 } | 324 } |
| 344 | 325 |
| 345 return { | 326 return { |
| 346 asArray, | |
| 347 concatenateObjects, | 327 concatenateObjects, |
| 348 compareArrays, | 328 compareArrays, |
| 349 comparePossiblyUndefinedValues, | 329 comparePossiblyUndefinedValues, |
| 350 dictionaryContainsValue, | 330 dictionaryContainsValue, |
| 351 getOnlyElement, | 331 getOnlyElement, |
| 352 getFirstElement, | 332 getFirstElement, |
| 353 groupIntoMap, | 333 groupIntoMap, |
| 354 mapItems, | 334 mapItems, |
| 355 filterItems, | 335 filterItems, |
| 356 inPlaceFilter, | 336 inPlaceFilter, |
| 357 invertArrayOfDicts, | 337 invertArrayOfDicts, |
| 358 arrayToDict, | 338 arrayToDict, |
| 359 identity, | 339 identity, |
| 360 findFirstIndexInArray, | 340 findFirstIndexInArray, |
| 361 findFirstInArray, | 341 findFirstInArray, |
| 362 findFirstKeyInDictMatching, | 342 findFirstKeyInDictMatching, |
| 363 mapValues, | 343 mapValues, |
| 364 setsEqual, | 344 setsEqual, |
| 365 }; | 345 }; |
| 366 }); | 346 }); |
| 367 </script> | 347 </script> |
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Chromium Code Reviews
Issue 2955043002:
Remove tr.b.asArray. (Closed)
