Counting number of words in a sentence in JavaScript

We are required to write a JavaScript function that takes in a string. Our function is supposed to count the number of alphabets (uppercase or lowercase) in the array.

For example − If the input string is −

const str = 'this is a string!';

Then the output should be −

13

Example

The code for this will be −

const str = 'this is a string!'; const isAlpha = char => {    const legend = 'abcdefghijklmnopqrstuvwxyz';    return legend.includes(char); }; const countAlphabets = (str = '') => {    let count = 0;    for(let i = 0; i < str.length; i++){       if(!isAlpha(str[i])){          continue;       };       count++;    };    return count; }; console.log(countAlphabets(str));

Output

And the output in the console will be −

13