Title Case A Sentence JavaScript

Let's say we are required to write a function that accepts a string and capitalizes the first letter of every word in that string and changes the case of all the remaining letters to lowercase.

For example, if the input string is ?

hello world coding is very interesting

The output should be ?

Hello World Coding Is Very Interesting

Let's define a function capitaliseTitle() that takes in a string and capitalises the first letter of each word and returns the string ?

Using Split and Map Method

let str = 'hello world coding is very interesting';

const capitaliseTitle = (str) => {
    const string = str
        .toLowerCase()
        .split(" ")
        .map(word => {
            return word[0].toUpperCase() + word.substr(1, word.length);
        })
        .join(" ");
    return string;
}

console.log(capitaliseTitle(str));

Output

Hello World Coding Is Very Interesting

Using Regular Expression

Another approach is to use regular expressions with the replace method:

let str = 'hello world coding is very interesting';

const capitalizeWithRegex = (str) => {
    return str.toLowerCase().replace(/\b\w/g, char => char.toUpperCase());
}

console.log(capitalizeWithRegex(str));

Output

Hello World Coding Is Very Interesting

Comparison

Conclusion

Both methods effectively convert strings to title case. The split-map approach is more readable, while the regex method is more concise and efficient for longer strings.