What is DRY Code

"Don't repeat yourself" (DRY) is a principle of software development aimed at reducing repetition of software patterns,[1] replacing it with abstractions or using data normalization to avoid redundancy.

The DRY principle is stated as "Every piece of knowledge must have a single, unambiguous, authoritative representation within a system".It usually means refactoring code by taking something done several times and turning it into a loop or a function. DRY code is easy to change, because you only have to make any change in one place.

Examples of Non-DRY and Dry Code

  let drinks = ['lemonade', 'soda', 'tea', 'water'];
  let food = ['beans', 'chicken', 'rice'];
  //non DRY code
  console.log(drinks[0]);
  console.log(drinks[1]);
  console.log(drinks[2]);
  console.log(drinks[3]);

  console.log(food[0]);
  console.log(food[1]);
  console.log(food[2]);

  // DRY code
  function logItems (array) {
    for (let i = 0; i < array.length; i++) {
      console.log(array[i]);
    }
  }

  logItems(drinks);
  logItems(food);

CONCLUSION

Whenever you finish writing some code, you should always look back to see if there is any way you can DRY it up, including:using descriptive variable names, taking repetitive bits of code and extracting them into a function or loop.

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