JavaScript localeCompare() method is used to compare two strings in the current locale. This method returns a number indicating whether a reference string comes before or after or is the same as the given string in sorted order.
string.localeCompare(compareString)This method returns sort order -1, 1, or 0 (for before, after, or equal) and the current locale is based on the language settings of the browser.
Return Value
- -1 if the string is sorted before the compareString
- 0 if the two strings are equal
- 1 if the string is sorted after the compareString
JavaScript localeCompare
Simple example code.
<!DOCTYPE html>
<html lang="en">
<body>
<script>
let text1 = "ab";
let text2 = "cd";
let text3 = "ab"
let res1 = text1.localeCompare(text2);
let res2 = text2.localeCompare(text1);
let res3 = text1.localeCompare(text3);
console.log(res1)
console.log(res2)
console.log(res3)
</script>
</body>
</html>Output:
More example
const a = 'réservé'; // with accents, lowercase
const b = 'RESERVE'; // no accents, uppercase
console.log(a.localeCompare(b)); // 1
console.log(a.localeCompare(b, 'en', { sensitivity: 'base' })); // 0Do comment if you have any doubts or suggestions on this JS string method.
Note: The All JS Examples codes are tested on the Firefox browser and the Chrome browser.
OS: Windows 10
Code: HTML 5 Version