lexicographical_order 1.0.3

A string generator that helps to implement a lexicographical order.

Lexicographical Order

A string generator that helps to implement a lexicographical order.

Installing

dependencies:
  lexicographical_order: 

import 'package:lexicographical_order/lexicographical_order.dart';

Usage

• Get a string between two strings in a lexicographical order.

  final mid = between(prev: 'B', next: 'D');
  final list = [mid, 'D', 'B'];
  assert(listEqauls(list..sort(), ['B', mid, 'D']);
  

• Generates strings that satisfy the minimum average string length and lexicographic order.

  const stringCount = 100;
  List<String> orderKeys = generateOrderKeys(stringCount).toList(); 
  

How to use?

• The between function accepts only alphabetic characters or an empty string as arguments.

  more precisely, the following code must return true.

  final alphabet = 'ABCDEFGHIJKLMNOPQRSTUWXYZabcdefghijklmnopqrstuwxyz'.split('');
  final String argument = /* omitted */
    
  return argument.isEmpty || argument.split('').every((e) => alphabet.contains(e));
  

  and the following constraint must also be satisfied:

  1. `prev` and `next` must not be equal to each other.
  1. `prev` must not precede `next` in a lexicographical order.
  

  Caution: the between function does not check the constraints in the release build for performance reasons.

• Don't use 'A' as first order key

  It is recommended to use generateOrderKeys(1).first for the first order key.