check if letter in string is uppercase javascript code example
Example 1: javascript check if all capital letter
function isUpper(str) {
return !/[a-z]/.test(str) && /[A-Z]/.test(str);
}
isUpper("FOO");
isUpper("bar");
isUpper("123");
isUpper("123a");
isUpper("123A");
isUpper("A123");
isUpper("");
Example 2: how to find if given character in a string is uppercase or lowercase in javascript
var str = S;
if (str == str.toUpperCase())
{
console.log(" Uppercase");
}
else
{
console.log("Lowercase");
}