isLowerCase

public bool isLowerCase()

A Boolean value indicating whether the string's alphabetical characters are all lowercase letters: true if all alphabetical characters in the string are lowercase letters or false if the string contains at least one non-lowercase letter.

Checks if the string is composed of only lowercase alphabetical letters (a-z).

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import System;   string foo = "foo"; string bar = "Bar"; string baz = "BAZ";   Console.log(foo.isLowerCase()); // true Console.log(bar.isLowerCase()); // false Console.log(baz.isLowerCase()); // false