To capitalize the first letter of each word in a string using JavaScript:

  1. Use the split() method to split the string into an array using whitespace as a delimiter.
  2. Use the map() method to iterate over the array elements.
  3. Use the slice() and charAt() methods to capitalize each element of the array.
  4. Use the join() method to combine all the array elements to get the capitalized string.
const phrase = 'how to learn javascript'

const words = phrase.split(' ')

const capitalWords = words.map(str => {
  return str.charAt(0).toUpperCase() + str.slice(1)
})

const capitalStr = capitalWords.join(' ')

console.log(capitalStr)
// How To Learn Javascript

Alternatively, you can capitalize all words in a string using the replace() method with a regular expression:

const phrase = 'how to learn javascript'

const capitalStr = phrase.replace(/\b\w/g, c => c.toUpperCase())

console.log(capitalStr)
// How To Learn Javascript

The regular expression matches the first letter of each word within the given string and transforms only that letter to uppercase.

If you want to capitalize all words of a paragraph on a web page, use the CSS text-transform property instead:

.capitalize {
    text-transform: capitalize;
}

Now just add the capitalize class to your HTML paragraph element as shown below:

<p class="capitalize">Welcome to JavaScript tutorials!</p>

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