Application of custom sorting algorithm in JavaScript

Preface

When processing data, we often need to sort the arrays to meet specific presentation or analysis needs. Although JavaScript provides built-insort()Methods to simplify this process, but custom sorting functions are particularly important when facing complex sorting logic. This article will use a specific case - sorting string arrays according to custom rules to deeply explore how to implement and apply custom sorting algorithms.

Content of the text

1. Background introduction

Suppose we have an array of strings that follow certain naming specifications, such as'Y1_DFGS.HYH008MT', where each part (e.g.Y1_、DFGS、.HYH008MT) may represent different information. Our goal is to sort the array according to certain rules (such as first by the part before the point and then by the number after the point).

2. Implementation ideas

To achieve the above, we will write a titlecustomSortThe function of()Comparison function parameters of the method. This function needs to follow certain rules to determine the relative order of two elements:

• Character-by-character comparison: First, compare the characters of the two strings one by one from left to right until the first different character is found.
• Unicode code point comparison: For different characters, the size relationship is determined by comparing their Unicode code point values.
• Length difference processing: If all characters in the corresponding position are the same but the string length is different, it is considered that the shorter string should be ranked first.

3. Code implementation

function customSort(a, b) {
  const aChars = ('');
  const bChars = ('');
  const aLen = ;
  const bLen = ;
  const minLength = (aLen, bLen);
  for (let i = 0; i < minLength; i++) {
    const charCodeDiff = aChars[i].charCodeAt(0) - bChars[i].charCodeAt(0);
    if (charCodeDiff !== 0) {
      return charCodeDiff;
    }
  }
  return aLen - bLen;
}
const arr = [
  'Y1_DFGS.HYH008MT',
  'Y1_EDFS.UHD002MT',
  'Y1_HHHS.DFG006MT',
  // ...Other strings];
(customSort);
(arr);

4. Application scenario expansion

Although the above example focuses on specific string sorting requirements,customSortThe logical framework of functions is very flexible and can be widely used in a variety of scenarios, such as:

• Sorting of numbers and letters: Adjust the comparison logic so that the numeric parts can be sorted in numerical size rather than characters.
• Date format string sort: For specific date formats, priority will be given to comparing year, month, date and other parts.
• Multi-keyword sorting: Design more complex comparison logic and support sorting rules based on multiple keywords.

in conclusion

Through custom sorting functions, we can accurately control the sorting logic of array elements, thereby meeting various complex application scenarios. Understanding and mastering such algorithms can not only improve our programming capabilities, but also solve more practical problems in actual development. I hope that the explanations and examples of this article will arouse your interest in custom sorting functions and play an important role in your project.

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