isUpperCase javascript Code Snippet in 2025
stringbeginner
Last Updated: 4 December 2025
Checks if a string is upper case.
- Convert the given string to upper case, using
String.prototype.toUpperCase()and compare it to the original.
const isUpperCase = str => str === str.toUpperCase();
isUpperCase('ABC'); // true
isUpperCase('A3@$'); // true
isUpperCase('aB4'); // falsejavascript snippet similar to isUpperCase For You in December 2025
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