30-seconds-of-code/snippets/isUpperCase.md

title, tags, cover, firstSeen, lastUpdated

title	tags	cover	firstSeen	lastUpdated
String is uppercase	string	flower-portrait-7	2018-01-06T11:16:05+02:00	2020-09-15T16:28:04+03:00

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