Question

44

How can I check if a string is all uppercase in JavaScript?

rated 0 times [ 51] [ 7] / answers: 1 / hits: 77893 / 11 Years ago, wed, july 10, 2013, 12:00:00

There is a Javascript/Jquery boolean function to test if a string is all uppercase?

example of matching:

hello => false

Hello => false

HELLO => true

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answered 11 Years ago susanap · Accepted Answer

function isUpperCase(str) {

    return str === str.toUpperCase();

}





isUpperCase(hello); // false

isUpperCase(Hello); // false

isUpperCase(HELLO); // true

You could also augment String.prototype:

String.prototype.isUpperCase = function() {

    return this.valueOf().toUpperCase() === this.valueOf();

};





Hello.isUpperCase(); // false

HELLO.isUpperCase(); // true