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Side by Side Diff: sdk/lib/core/iterable.dart

Issue 12537009: Rename XMatching to XWhere. (Closed) Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart
Patch Set: Merge and rebuild dom libraries. Created 7 years, 9 months ago
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1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file 1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file
2 // for details. All rights reserved. Use of this source code is governed by a 2 // for details. All rights reserved. Use of this source code is governed by a
3 // BSD-style license that can be found in the LICENSE file. 3 // BSD-style license that can be found in the LICENSE file.
4 4
5 part of dart.core; 5 part of dart.core;
6 6
7 /** 7 /**
8 * The [Iterable] interface allows to get an [Iterator] out of an 8 * The [Iterable] interface allows to get an [Iterator] out of an
9 * [Iterable] object. 9 * [Iterable] object.
10 * 10 *
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316 return result; 316 return result;
317 } 317 }
318 318
319 /** 319 /**
320 * Returns the first element that satisfies the given predicate [f]. 320 * Returns the first element that satisfies the given predicate [f].
321 * 321 *
322 * If none matches, the result of invoking the [orElse] function is 322 * If none matches, the result of invoking the [orElse] function is
323 * returned. By default, when [orElse] is `null`, a [StateError] is 323 * returned. By default, when [orElse] is `null`, a [StateError] is
324 * thrown. 324 * thrown.
325 */ 325 */
326 E firstMatching(bool test(E value), { E orElse() }) { 326 E firstWhere(bool test(E value), { E orElse() }) {
327 // TODO(floitsch): check that arguments are of correct type? 327 // TODO(floitsch): check that arguments are of correct type?
328 for (E element in this) { 328 for (E element in this) {
329 if (test(element)) return element; 329 if (test(element)) return element;
330 } 330 }
331 if (orElse != null) return orElse(); 331 if (orElse != null) return orElse();
332 throw new StateError("No matching element"); 332 throw new StateError("No matching element");
333 } 333 }
334 334
335 /** 335 /**
336 * Returns the last element that satisfies the given predicate [f]. 336 * Returns the last element that satisfies the given predicate [f].
337 * 337 *
338 * If none matches, the result of invoking the [orElse] function is 338 * If none matches, the result of invoking the [orElse] function is
339 * returned. By default, when [orElse] is [:null:], a [StateError] is 339 * returned. By default, when [orElse] is [:null:], a [StateError] is
340 * thrown. 340 * thrown.
341 */ 341 */
342 E lastMatching(bool test(E value), {E orElse()}) { 342 E lastWhere(bool test(E value), {E orElse()}) {
343 // TODO(floitsch): check that arguments are of correct type? 343 // TODO(floitsch): check that arguments are of correct type?
344 E result = null; 344 E result = null;
345 bool foundMatching = false; 345 bool foundMatching = false;
346 for (E element in this) { 346 for (E element in this) {
347 if (test(element)) { 347 if (test(element)) {
348 result = element; 348 result = element;
349 foundMatching = true; 349 foundMatching = true;
350 } 350 }
351 } 351 }
352 if (foundMatching) return result; 352 if (foundMatching) return result;
353 if (orElse != null) return orElse(); 353 if (orElse != null) return orElse();
354 throw new StateError("No matching element"); 354 throw new StateError("No matching element");
355 } 355 }
356 356
357 /** 357 /**
358 * Returns the single element that satisfies [f]. If no or more than one 358 * Returns the single element that satisfies [f]. If no or more than one
359 * element match then a [StateError] is thrown. 359 * element match then a [StateError] is thrown.
360 */ 360 */
361 E singleMatching(bool test(E value)) { 361 E singleWhere(bool test(E value)) {
362 // TODO(floitsch): check that argument is of correct type? 362 // TODO(floitsch): check that argument is of correct type?
363 E result = null; 363 E result = null;
364 bool foundMatching = false; 364 bool foundMatching = false;
365 for (E element in this) { 365 for (E element in this) {
366 if (test(element)) { 366 if (test(element)) {
367 if (foundMatching) { 367 if (foundMatching) {
368 throw new StateError("More than one matching element"); 368 throw new StateError("More than one matching element");
369 } 369 }
370 result = element; 370 result = element;
371 foundMatching = true; 371 foundMatching = true;
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433 */ 433 */
434 abstract class BidirectionalIterator<T> extends Iterator<T> { 434 abstract class BidirectionalIterator<T> extends Iterator<T> {
435 /** 435 /**
436 * Move back to the previous element. 436 * Move back to the previous element.
437 * 437 *
438 * Returns true and updates [current] if successful. Returns false 438 * Returns true and updates [current] if successful. Returns false
439 * and sets [current] to null if there is no previous element. 439 * and sets [current] to null if there is no previous element.
440 */ 440 */
441 bool movePrevious(); 441 bool movePrevious();
442 } 442 }
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