bergwerf

/// Buffered stream sink that uses a string buffer.
class BufferedStringSink implements StringSink {
  final buffer = new StringBuffer();
  final int bufferThreshold;
  final StringSink target;

  BufferedStringSink(this.target, {this.bufferThreshold: 10000});

  void flush() {
    target.write(buffer);

bergwerf

void main() {
  final mappedIterable = ['a', 'b', 'c', 'd'].map((ch) {
    print('mapped $ch');
    return ch;
  }).where((ch) {
    return ch != 'a';
  });
  if (mappedIterable.isNotEmpty) {
    print('iterable is non-empty');
    print(mappedIterable.first);

bergwerf

IDEAS

• Wrapper of List<List<T>> as List2D<T>
• List shaped tree processing utilities

bergwerf

void main() {
  final data = new List.generate(100, (i) => i);
  final result = data.where((i) {
    print('where $i');
    return i > 0 && i % 10 == 0;
  }).map((i) {
    print('map $i');
    return i / 10;
  });
  print('==========');

bergwerf

body {
  font-family: monospace;
}

.title {
  font-size: 1em;
  font-weight: bold;
  text-decoration: underline;
  padding: 1em;
}

bergwerf

typedef R Fn1<R, T1>(T1 arg1);
typedef R Fn2<R, T1, T2>(T1 arg1, T2 arg2);

Fn1<Fn1<R, T2>, T1> curry12<R, T1, T2>(Fn2<R, T1, T2> fn) {
  return (T1 arg1) => (T2 arg2) => fn(arg1, arg2);
}

Fn1<Fn1<R, T1>, T2> curry21<R, T1, T2>(Fn2<R, T1, T2> fn) {
  return (T2 arg2) => (T1 arg1) => fn(arg1, arg2);
}

bergwerf

typedef bool Case<T>(T input);
Case<num> gt(num than) => (num x) => x != null && x > than;
Case nil = (instance) => instance == null;

O match<T, O>(T input, Map<dynamic, Function> cases) {
  for (final _case in cases.keys) {
    if (_case == input || (_case is Function && _case(input) == true)) {
      return cases[_case]();
    }
  }

bergwerf

/// Unpack an integer list into a list of integer lists.
List<List<int>> _unpackIntLists(List<int> input) {
  final output = new List<List<int>>();
  for (var i = 0; i < input.length;) {
    final length = input[i++];
    output.add(input.sublist(i, i + length));
    i += length;
  }
  return output;
}

bergwerf

/// A hack to copy a string to the clipboard.
bool _copyToClipboardHack(String text) {
  final textarea = new TextAreaElement();
  document.body.append(textarea);
  textarea.style.border = '0';
  textarea.style.margin = '0';
  textarea.style.padding = '0';
  textarea.style.opacity = '0';
  textarea.style.position = 'absolute';
  textarea.readOnly = true;

bergwerf

// Copyright (c) 2017, Herman Bergwerf. All rights reserved.
// Use of this source code is governed by a MIT-style license
// that can be found in the LICENSE file.

.checkbox {
  font-family: KaTeX_Main;
  user-select: none;
  padding: .3em;

  &:before {