check if string contains lowercase javascript code example

Example 1: js if text contains lowercase

function hasLowerCase(str) {
    return str.toUpperCase() != str;
}

console.log("HeLLO: ", hasLowerCase("HeLLO"));
console.log("HELLO: ", hasLowerCase("HELLO"));

Example 2: check if string contains lowercase javascript

// A minified version of the other one:
const hasLowerCase= s => s.toUpperCase() != s;

console.log("HeLLO: ", hasLowerCase("HeLLO"));
console.log("HELLO: ", hasLowerCase("HELLO"));