Would you like to know how to convert the first letter of a string into capital letters? Let’s explore the possible pathways.

1) Using slice

• Convert the first letter of a string into capital letters using the toUpperCase() method.

• Extract the remaining characters from a string with slice() method.

• Combining the two results will return the converted string.

const word = 'react';
const capitalizedWord = word[0].toUpperCase() + word.slice(1);

2) Using substr

• Extract the first letter from a string using substr() method and change it into upper case using toUpperCase() method.

• Extract the remaining characters from a string with substr() method.

• Combining the two results will return the converted string.

const name = 'angular';
const capitalizedName = name.substr(0,1).toUpperCase() + name.substr(1, name.length);

3) Using split

• Splitting the string into separate characters and storing them as an array using split() method.

• Convert the first item of an array into capital letters using the toUpperCase() method.

• Converting the array of items into string using the join() method.

const text = 'vue';
const capitalizedText = text.split('');
capitalizedText[0] = capitalizedText[0].toUpperCase();
capitalizedText.join('');

4) Using spread

• Splitting the string into separate characters and storing them as an array using spread operator.

• Convert the first item of an array into capital letters using the toUpperCase() method.

• Converting the array of items into string using the join() method.

const channelName = 'codingsparkles';
const convertedName = [...channelName];
convertedName[0] = convertedName[0].toUpperCase();
convertedName.join('');

Sample work used with the above code snippets can be found in the following codepen.

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