codewars-best-solutions

From which new tricks and lessons can be learnt.

JavaScript

• Using RegExp's Capturing Groups to manipulate strings
• Third solution is better / simpler / less bug-prone (according to comments)
• Groups:
  1. First character of word
  2. Remaining characters of word
• \b => Word boundary (used to match word; e.g: /\b(\w*)\b/g)
• \w => Any alphanumeric character including the underscore; equivalent to [A-Za-z0-9_]
• Link

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• Calling functions that accepts multiple arguments using an Array
• Link

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• Using RegExp's Capturing Groups to manipulate strings
• Own solution is pretty interesting and simple as well.
• String interpolation used to separate last item of array.
• Link

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• Using Array Destructuring for better readability
• Avoids annoying array[n]
• Link

Python

• Vowel Count
  1. Using Regex
  2. Using List Comprehension: an elegant way to define and create lists based on existing lists
• Link

• Lambda function: Small anonymous function

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• Mapping a List
  1. Using List Comprehension
  2. Using map
• Link

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• Abbreviating a two-word name
  1. Using List Destructuring
  2. Using List Comprehension
• Link

C#

• Check if an array contains a value
  1. Using namespace System.Linq
  2. Using namespace System
• Tips:
  • Classes can be made available using using static directive
    • e.g. using static System.Linq.Enumerable
  • Namespace aliases can be used to avoid name clashes
    • e.g. using Linq=System.Linq
• Link