//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(); });
};

function capitalizeFirstLetter(string) { return string.charAt(0).toUpperCase() + string.slice(1);
}
console.log(capitalizeFirstLetter('foo')); // Foo

function capitalizeFirstLetter(str) { return str.charAt(0).toUpperCase() + str.slice(1);
}
// Example usage
const text = "hello world";
const capitalizedText = capitalizeFirstLetter(text);
console.log(capitalizedText); // Output: "Hello world"

function capitalizeFirstLetter(str) { return str.charAt(0).toUpperCase() + str.slice(1);
}
// Example usage
const myString = "hello world";
const capitalizedString = capitalizeFirstLetter(myString);
console.log(capitalizedString); // Output: "Hello world"

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

String.prototype.capitalize = function() { return this.charAt(0).toUpperCase() + this.slice(1);
}

function ucwords (str) { return (str + '').replace(/^([a-z])|\s+([a-z])/g, function ($1) { return $1.toUpperCase(); });
}
console.log(ucwords("hello world"));

const upperCase = function(names){ const toLower = names.toLowerCase().split(' '); const namesUpper = []; for(const wordName of toLower){ namesUpper.push(wordName[0].toUpperCase() + wordName.slice(1)); } return namesUpper.join(' ');
}

const names = ["alice", "bob", "charlie", "danielle"];
const namesCap = names.map((name) => { return `${name[0].toUpperCase()}${name.slice(1)}`;
});
console.log(namesCap);