String is uppercase

OSCC · JavaScript, String · Sep 15, 2020

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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