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1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2012, 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 // Generic utility functions. | 5 // Generic utility functions. |
6 | 6 |
7 /** Invokes [callback] and returns how long it took to execute in ms. */ | 7 /** Invokes [callback] and returns how long it took to execute in ms. */ |
8 num time(callback()) { | 8 num time(callback()) { |
9 final watch = new Stopwatch(); | 9 final watch = new Stopwatch(); |
10 watch.start(); | 10 watch.start(); |
11 callback(); | 11 callback(); |
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70 /** | 70 /** |
71 * Joins [items] into a single, comma-separated string using [conjunction]. | 71 * Joins [items] into a single, comma-separated string using [conjunction]. |
72 * E.g. `['A', 'B', 'C']` becomes `"A, B, and C"`. | 72 * E.g. `['A', 'B', 'C']` becomes `"A, B, and C"`. |
73 */ | 73 */ |
74 String joinWithCommas(List<String> items, [String conjunction = 'and']) { | 74 String joinWithCommas(List<String> items, [String conjunction = 'and']) { |
75 if (items.length == 1) return items[0]; | 75 if (items.length == 1) return items[0]; |
76 if (items.length == 2) return "${items[0]} $conjunction ${items[1]}"; | 76 if (items.length == 2) return "${items[0]} $conjunction ${items[1]}"; |
77 return Strings.join(items.getRange(0, items.length - 1), ', ') + | 77 return Strings.join(items.getRange(0, items.length - 1), ', ') + |
78 ', $conjunction ' + items[items.length - 1]; | 78 ', $conjunction ' + items[items.length - 1]; |
79 } | 79 } |
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