Finding the longest word in a sentence/string (freecodecampnotes)

In this exercise we are given the following snippet to find the longest word in the sentence.

findLongestWordLength(str) {

   return maxLen
}

findLongestWordLength("The quick brown fox jumped over the lazy dog");

Below are our attempts

	//Attempt 1
	function findLongestWordLength(str) {
	let arr=str.split('')
	let maxLen=0;
	for(let i=0;i<arr.length;i++){
	if(arr[i].length>maxLen){
	maxLen=arr[i].length
	}
	}
	return maxLen
	}
	//Attempt 2
	function findLongestWordLength(str) {
	let arr=str.split(' ')
	let maxLen=0;
	for(let i=0;i<arr.length;i++){
	if(arr[i].length>maxLen){
	maxLen=arr[i].length
	}
	}
	return maxLen
	}

view raw longest.js hosted with ❤ by GitHub

What is the correct answer? Attempt 2 as always, the reason being..

The split function