JavaScript: Capitalize the first letter of every word in a string

JavaScript fundamental (ES6 Syntax): Exercise-264 with Solution

Capitalize First Letters of Words

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

• Use String.prototype.replace() to match the first character of each word and String.prototype.toUpperCase() to capitalize it.

Sample Solution:

JavaScript Code:

// Define a function 'capitalizeEveryWord' to capitalize the first letter of each word in a string
const capitalizeEveryWord = str =>
  // Use regular expression to match the first letter of each word (\b denotes word boundary)
  // and replace it with its uppercase equivalent
  str.replace(/\b[a-z]/g, char => char.toUpperCase());

// Test the function with a sample string
console.log(capitalizeEveryWord('hello world!')); // Output: "Hello World!"

Output:

Hello World!

Visual Presentation:

Flowchart:

Live Demo:

See the Pen javascript-basic-exercise-264-1 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript program that capitalizes the first letter of every word in a string.
• Write a JavaScript function that splits a sentence into words, capitalizes each, and rejoins them.
• Write a JavaScript program that uses map() to transform an array of words to have their first letter in uppercase.
• Write a JavaScript function that converts a string to title case by capitalizing the first letter of each word.

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