Leaf Petersen
745f112ef6
Opt an initial batch of files under samples, samples-dev, utils, and runtime/tools/dartfuzz out of null safety in preparation for switching the flag on by default. Change-Id: Icdfd52a5a969e678a7205903332f73fe3841c223 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/166960 Reviewed-by: Daco Harkes <dacoharkes@google.com> Commit-Queue: Leaf Petersen <leafp@google.com>
37 lines
1.2 KiB
Dart
37 lines
1.2 KiB
Dart
// Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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// @dart = 2.9
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part of utilslib;
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/**
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* General purpose string manipulation utilities.
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*/
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class StringUtils {
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/**
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* Returns either [str], or if [str] is null, the value of [defaultStr].
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*/
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static String defaultString(String str, [String defaultStr = '']) {
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return str == null ? defaultStr : str;
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}
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/** Parse string to a double, and handle null intelligently */
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static double parseDouble(String str, [double ifNull = null]) {
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return (str == null) ? ifNull : double.parse(str);
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}
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/** Parse string to a int, and handle null intelligently */
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static int parseInt(String str, [int ifNull = null]) {
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return (str == null) ? ifNull : int.parse(str);
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}
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/** Parse bool to a double, and handle null intelligently */
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// TODO(jacobr): corelib should have a boolean parsing method
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static bool parseBool(String str, [bool ifNull = null]) {
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assert(str == null || str == 'true' || str == 'false');
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return (str == null) ? ifNull : (str == 'true');
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}
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}
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