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isUpperCase javascript Code Snippet in 2025

stringbeginner

Last Updated: 14 April 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'); // false

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