Answers for "how to keep only the first letter in javascript"

javascript uppercase first letter

//capitalize only the first letter of the string. 
function capitalizeFirstLetter(string) {
    return string.charAt(0).toUpperCase() + string.slice(1);
}
//capitalize all words of a string. 
function capitalizeWords(string) {
    return string.replace(/(?:^|\s)\S/g, function(a) { return a.toUpperCase(); });
};

js only first 50 letters

'Hiya how are you'.substring(0,50);

javascript capitalize first letter

const lower = 'this is an entirely lowercase string';
const upper = lower.charAt(0).toUpperCase() + lower.substring(1);

javascript only allow show first few characters from a string

var string = 'Hey, I am good';
string.substring(0,3); // show first 3 characters
//result "Hey"