count_words_in_a_string.md

Count Words in a String

Count Words in a String

To count the number of words in a string, split the string by spaces and count the resulting elements.

Algorithm:

1. Split the string by spaces into an array of words.
2. Filter out any empty strings from the array.
3. Return the length of the array.

Example:

function countWords(str) {
    return str.split(' ').filter(word => word !== '').length;
}

// Example usage
console.log(countWords('Hello world, how are you?')); // Output: 5
console.log(countWords('   This is a test   ')); // Output: 4

This method has a time complexity of O(n), where n is the length of the string.

Tags: basic, JavaScript, Strings, Algorithm