How to count first letter of each word in d3.js?

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// Sample text
var text = "This is a sample text to count first letter of each word";

// Split the text into words
var words = text.split(" ");

// Object to store the count of first letters
var letterCount = {};

// Iterate over each word and count the first letter
words.forEach(function(word) {
  var firstLetter = word.charAt(0).toUpperCase();
  if (letterCount.hasOwnProperty(firstLetter)) {
    letterCount[firstLetter]++;
  } else {
    letterCount[firstLetter] = 1;
  }
});

// Print the result
console.log(letterCount);