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Get first letter of each word JavaScript | Example code

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Use the match() method with RegEx and join() method to get first letter of each word in JavaScript. Where join method is to join the array into a string.

Get the first letter of each word in JavaScript

Simple example code.

<!DOCTYPE html>


      var str = "Java Script Object Notation";
      var matches = str.match(/\b(\w)/g); 
      var acronym = matches.join(''); 




Get first letter of each word JavaScript

Another way

let str = "Java Script Object Notation";
let acronym = str.split(/\s/).reduce((response,word)=> response+=word.slice(0,1),'')



function getFirstLetters(str) {
  const firstLetters = str
    .split(' ')
    .map(word => word[0])

  return firstLetters;

// 👇️ ABC
console.log(getFirstLetters('Alice, Bob, Charlie'));

// 👇️ ONE
console.log(getFirstLetters('Oscar   Noah   Emily.'));


To get the first letter of each word in a string using JavaScript, you can follow these steps:

  1. Split the string into an array of words using the split() method, which splits the string based on whitespace.
  2. Iterate over each word in the array and extract the first letter using the charAt() method or by accessing the index [0].
  3. Store the first letters in a new array or concatenate them into a new string.
  4. Optionally, join the first letters back together into a string using the join() method if you stored them in an array.

Here’s an example implementation:

function getFirstLetters(str) {
  var words = str.split(' ');
  var firstLetters = [];

  for (var i = 0; i < words.length; i++) {
    var word = words[i];
    var firstLetter = word.charAt(0); // or word[0]

  var result = firstLetters.join('');

  return result;

// Example usage
var sentence = "Hello World";
var firstLetters = getFirstLetters(sentence);
console.log(firstLetters); // Output: HW

Do comment if you have any doubts or suggestions on this JS code.

Note: The All JS Examples codes are tested on the Firefox browser and the Chrome browser.

OS: Windows 10

Code: HTML 5 Version

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