dart_helper_utils

Dart utilities and ergonomic extensions with type-safe conversions via the re-exported convert_object package.

Repository: https://github.com/omar-hanafy/dart_helper_utils Package: https://pub.dev/packages/dart_helper_utils

Installation

Add the package to your pubspec.yaml:

dependencies:
  dart_helper_utils: ^6.0.0-dev.4

Import

import 'dart:async';

import 'package:dart_helper_utils/dart_helper_utils.dart';

Highlights

• Type-safe conversions (from convert_object) with configurable strictness.
• Collections: chunking, windowing, partitioning, and safe map/list helpers.
• Strings: case conversion, slugify, parsing, validation, and masking.
• Numbers: formatting via intl, file size helpers, and HTTP status helpers.
• Date/Time: rounding, comparisons, and HTTP date formatting.
• Async: retries, timeouts, concurrency throttling, debouncing/throttling.
• Streams: retries and safe controller additions.
• Raw data: HTTP status messages, CSS colors, and suffix maps.

Quick start

import 'package:dart_helper_utils/dart_helper_utils.dart';

void main() async {
  final json = '{"count": "42"}';
  final data = convertToMap<String, Object?>(json);
  final count = convertToInt(data['count']);
  print(count); // 42

  final slug = 'Hello, World!'.slugify();
  print(slug); // hello-world

  final chunked = [1, 2, 3, 4, 5].chunks(2);
  print(chunked); // [[1, 2], [3, 4], [5]]

  final results = await [1, 2, 3].mapConcurrent(
    (value) async => value * 2,
    parallelism: 2,
  );
  print(results); // [2, 4, 6] (completion order)

  try {
    await TimeUtils.runWithTimeout(
      task: () async {
        await Future<void>.delayed(const Duration(milliseconds: 50));
        return 'finished';
      },
      timeout: const Duration(milliseconds: 20),
    );
  } on TimeoutException catch (e) {
    print('timed out: $e');
  }
}

API overview

Conversions (re-exported from convert_object)

• convertToInt(value, {defaultValue}) -> int (throws ConversionException)
• tryConvertToInt(value) -> int?
• convertToDateTime(value, {format, locale}) -> DateTime
• Convert.toInt(value, {defaultValue}) -> int
• Convert.configure(ConvertConfig) -> void

Strings

• String.toCamelCase, toPascalCase, toSnakeCase, toKebabCase
• String.slugify({separator})
• String.parseDuration() -> Duration
• String.maskEmail, String.mask({visibleStart, visibleEnd})
• String.normalizeWhitespace(), String.removeEmptyLines, String.words, String.lines

Scope functions

• Re-exported from convert_object (>= 1.0.2).
• Object.let((it) => ...)
• Object.also((it) => ...)
• Object.takeIf((it) => ...)
• Object.takeUnless((it) => ...)

Collections

• Iterable<E>.chunks(size) -> List<List<E>>
• Iterable<E>.windowed(size, {step, partials})
• Iterable<E>.mapConcurrent(action, {parallelism}) (completion order)
• Iterable<E>.concatWithSingleList(iterable)
• Iterable<E>.concatWithMultipleList(iterables)
• Map<String, Object?>.getPath(path, {delimiter, parseIndices})
• Map<String, Object?>.setPath(path, value, {delimiter, parseIndices})
• Map<String, Object?>.deepMerge(other)

URIs

• Uri.domainName -> String
• Uri.rebuild({ ...builders }) (if both path builders are set, pathSegmentsBuilder wins)
• Uri.withQueryParameters(queryParameters)
• Uri.mergeQueryParameters(queryParameters)
• Uri.removeQueryParameters(keys)
• Uri.appendPathSegment(segment) / appendPathSegments(segments)
• Uri.normalizeTrailingSlash({trailingSlash})

Date and time

• DateTime.httpDateFormat -> String
• DateTime.isBetween(start, end, {inclusiveStart, inclusiveEnd, ignoreTime, normalize})
• DateTime.roundTo(duration)
• Duration.toClockString()
• Duration.toHumanShort()

Async helpers

• Future<T>.minWait(duration)
• Future<T>.timeoutOrNull(timeout)
• Future<T> Function().retry({retries, delay, retryIf})
• Iterable<Future<T> Function()>.waitConcurrency({concurrency}) (completion order)

Time utilities

• TimeUtils.executionDuration(task) -> Duration (sync or async)
• TimeUtils.executionDurations(tasks) -> List<Duration>
• TimeUtils.compareExecutionTimes(taskA: ..., taskB: ...)
• TimeUtils.debounce(func, duration, {maxWait, immediate}) returns DebouncedCallback
• TimeUtils.throttle(func, interval, {leading, trailing}) returns ThrottledCallback
• TimeUtils.runWithTimeout(task: ..., timeout: ...) throws TimeoutException without cancelling the original work and swallows late errors to keep the zone clean

Streams

• StreamController<T>.safeAdd(event)
• Stream<T>.retry({retryCount, delayFactor, shouldRetry})

HTTP helpers

• num.isSuccessCode, num.isClientErrorCode, num.isServerErrorCode
• num.statusCodeRetryDelay
• num.toHttpStatusUserMessage

Raw data

• greekNumberSuffixes -> List<String>
• httpStatusMessages -> Map<int, String>
• cssColorNamesToArgb -> Map<String, int>

Notes

• mapConcurrent and waitConcurrency return results in completion order.
• TimeUtils.runWithTimeout returns a TimeoutException when the timeout fires, but the original task keeps running in the background.

Examples

Conversions

print(convertToInt('42')); // 42
print(tryConvertToInt('x')); // null

DateTime.isBetween

final start = DateTime(2024, 1, 1);
final end = DateTime(2024, 1, 2);
print(DateTime(2024, 1, 1).isBetween(start, end)); // true
print(DateTime(2024, 1, 2).isBetween(start, end)); // false

String.parseDuration

print('1h 30m'.parseDuration()); // 1:30:00.000000