Pangram test

pangram.js

function processData(input) {
    var alpha = 'abcdefghijklmnopqrstuvwxyz'.split('')
    var inputArr = input.split('');    
    var countArr = []
    
    inputArr.forEach(function(i){
        i = i.toLowerCase();
        if (alpha.indexOf(i) >= 0 && countArr.indexOf(i) === -1 ) {
            countArr.push(i);
        }
    });
    countArr.length >= alpha.length ? console.log('pangram') : console.log('not pangram');
}