How to sort input letters in js

In JavaScript, use the sort() method to sort letters: by default, sorted according to ASCII code value (lowercase letters first). By providing a custom comparison function, it is possible to sort according to custom rules (for example: case-insensitive).

How to sort letters in JavaScript

Answer: Use sort () method, which can sort letters in a string based on ASCII code values ​​or custom comparison functions.

Detailed description:

To sort letters in a JavaScript string, you can use the sort() method. This method converts the string to an array and sorts its elements according to the specified collation.

Use ASCII code value to sort:

• Use the default rules, sort() method will sort letters according to ASCII code value . Lowercase letters have a smaller ASCII code value than uppercase letters, so lowercase letters will be sorted before uppercase letters.

<code class="javascript">const str = "hello";
const sortedStr = str.split("").sort();
console.log(sortedStr); // ["e", "h", "l", "l", "o"]</code>

Use custom comparison function to sort:

• You can also provide a custom comparison function to control the sorting rules. The comparison function accepts two elements as arguments and returns a number:

  • Returns a negative number if the first element should come before the second element.
  • Return a positive number if the first element should come after the second element.
  • If the elements are equal, return 0.

<code class="javascript">const compareFunction = (a, b) => {
  const lowerA = a.toLowerCase();
  const lowerB = b.toLowerCase();
  if (lowerA < lowerB) {
    return -1;
  } else if (lowerA > lowerB) {
    return 1;
  } else {
    return 0;
  }
};

const str = "Hello";
const sortedStr = str.split("").sort(compareFunction);
console.log(sortedStr); // ["e", "H", "l", "l", "o"]</code>

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