JavaScript: Capitalize the first letter of each word of a given string

JavaScript Basic: Exercise-50 with Solution

Capitalize First Letter of Each Word in String

Write a JavaScript program to capitalize the first letter of each word in a given string.

This JavaScript program capitalizes the first letter of each word in a given string. It splits the string into words, capitalizes the first letter of each word, and then joins the words back into a single string.

Visual Presentation:

Sample Solution:

JavaScript Code:

// Define a function named capital_letter with parameter str
function capital_letter(str) 
{
    // Split the input string into an array of words
    str = str.split(" ");

    // Iterate through each word in the array
    for (var i = 0, x = str.length; i < x; i++) {
        // Capitalize the first letter of each word and concatenate it with the rest of the word
        str[i] = str[i][0].toUpperCase() + str[i].substr(1);
    }

    // Join the modified array of words back into a string
    return str.join(" ");
}

// Log the result of calling capital_letter with the given string to the console
console.log(capital_letter("Write a JavaScript program to capitalize the first letter of each word of a given string.")); 

Output:

Write A JavaScript Program To Capitalize The First Letter Of Each Word Of A Given String.

Live Demo:

See the Pen JavaScript - capitalize the first letter of each word of a given string - basic-ex-50 by w3resource (@w3resource) on CodePen.

Flowchart:

ES6 Version:

// Define a function named capital_letter with parameter str
const capital_letter = (str) => {
    // Split the input string into an array of words
    str = str.split(" ");

    // Iterate through each word in the array
    for (let i = 0, x = str.length; i < x; i++) {
        // Capitalize the first letter of each word and concatenate it with the rest of the word
        str[i] = str[i][0].toUpperCase() + str[i].substr(1);
    }

    // Join the modified array of words back into a string
    return str.join(" ");
};

// Log the result of calling capital_letter with the given string to the console
console.log(capital_letter("Write a JavaScript program to capitalize the first letter of each word of a given string."));
The following tool visualize what the computer is doing step-by-step as it executes the said program: 
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For more Practice: Solve these Related Problems:

Write a JavaScript program that capitalizes the first letter of each word in a string and lowercases the remaining letters.
Write a JavaScript program that transforms a sentence so that each word's first letter is capitalized and then reverses the entire word order.
Write a JavaScript program that converts the first letter of every word in a string to uppercase, ignoring words that are shorter than three letters.



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