A method for transforming each word in a string to begin with a capital letter

Question

A method for transforming each word in a string to begin with a capital letter

I'm not sure if my approach to solving this problem is correct:

function capitalizeFirstLetter (string) {
    let stringArray = string.split(' ');
    for (let i = 0; i < stringArray.length; i++) { 
        let firstLetter = stringArray[i].charAt(0);
        let firstLetterCap = firstLetter.toUpperCase();
    } 
    return stringArray.join(' ');
} 
console.log(capitalizeFirstLetter('cat on the mat'));

It appears that the function just returns the original string without capitalizing anything.

javascript arrays for-loop

Answer 1

Answer №1

It is recommended to utilize the .map function for this task

function capitalizer (str) {
  return str
    .split(' ')
    .map((word) => word[0].toUpperCase() + word.slice(1))
    .join(' ')
}

As mentioned by Patrick Roberts, please note that this code may throw an exception if the string contains multiple consecutive spaces.

Consider using Regex to extract words and apply the function to each word

function capitalize(str) {
    return str.replace(/\w\S*/g, (txt) => txt.charAt(0).toUpperCase() + txt.substr(1).toLowerCase());
};

Answer 2

It is recommended to utilize the .map function for this task

function capitalizer (str) {
  return str
    .split(' ')
    .map((word) => word[0].toUpperCase() + word.slice(1))
    .join(' ')
}

As mentioned by Patrick Roberts, please note that this code may throw an exception if the string contains multiple consecutive spaces.

Consider using Regex to extract words and apply the function to each word

function capitalize(str) {
    return str.replace(/\w\S*/g, (txt) => txt.charAt(0).toUpperCase() + txt.substr(1).toLowerCase());
};

Answer 3

Answer №2

Your logic contains an error; the correct approach would be to convert each string to uppercase.

function convertToUppercase (string) {
    let stringArr = string.split(' ');
    for (let i = 0; i < stringArr.length; i++) { 
        stringArr[i] = stringArr[i].toUpperCase();
    } 
    return stringArr.join(' ');
} 
console.log(convertToUppercase('the quick brown fox'));

Answer 4

Your logic contains an error; the correct approach would be to convert each string to uppercase.

function convertToUppercase (string) {
    let stringArr = string.split(' ');
    for (let i = 0; i < stringArr.length; i++) { 
        stringArr[i] = stringArr[i].toUpperCase();
    } 
    return stringArr.join(' ');
} 
console.log(convertToUppercase('the quick brown fox'));

Answer 5

Answer №3

If you want to capitalize any lowercase letter that comes after a space or at the beginning of a line, regular expressions can help you achieve that.

With a positive lookbehind, you can easily achieve this result.

function capitalizeFirstLetter (string) {
    return string
    .replace(/(?<=^|\s)[a-z]/g, s => s.toUpperCase())
} 
console.log(capitalizeFirstLetter('cat on the mat'));

Answer 6

If you want to capitalize any lowercase letter that comes after a space or at the beginning of a line, regular expressions can help you achieve that.

With a positive lookbehind, you can easily achieve this result.

function capitalizeFirstLetter (string) {
    return string
    .replace(/(?<=^|\s)[a-z]/g, s => s.toUpperCase())
} 
console.log(capitalizeFirstLetter('cat on the mat'));

Answer 7

Answer №4

Here is a quick and easy way to capitalize the first letter of each word in a string:

const capitalizeWords = str => str.replace(/\b[a-z]/g, char => char.toUpperCase())

console.log(capitalizeWords('the quick brown fox'))

Answer 8

Here is a quick and easy way to capitalize the first letter of each word in a string:

const capitalizeWords = str => str.replace(/\b[a-z]/g, char => char.toUpperCase())

console.log(capitalizeWords('the quick brown fox'))

Answer 9

Answer №5

To ensure the original code works properly, it is important to utilize the firstLetterCap and substitute it with each of the initial letters.

    function capitalizer (string) {
    stringArray = string.split(' ');
    for (let i = 0; i< stringArray.length; i++) { 
        var firstLetter = stringArray[i].charAt(0);
        var firstLetterCap = firstLetter.toUpperCase();
        stringArray[i] = firstLetterCap + stringArray[i].slice(1);//cap + everything else
    } 
    return stringArray.join(' ');
    } 
    console.log(capitalizer('cat on the mat'));

Answer 10

To ensure the original code works properly, it is important to utilize the firstLetterCap and substitute it with each of the initial letters.

    function capitalizer (string) {
    stringArray = string.split(' ');
    for (let i = 0; i< stringArray.length; i++) { 
        var firstLetter = stringArray[i].charAt(0);
        var firstLetterCap = firstLetter.toUpperCase();
        stringArray[i] = firstLetterCap + stringArray[i].slice(1);//cap + everything else
    } 
    return stringArray.join(' ');
    } 
    console.log(capitalizer('cat on the mat'));

A method for transforming each word in a string to begin with a capital letter

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

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