JavaScript developers from Europe
Made good progress with this quite quickly (once I identitfied that my undefined output was caused by me not calling the function - D’Oh!).
Basic Approach
Once I had the key callback logic down (list.[method](function(object) { ... })) I literally swapped in various methods to figure out the best approach: forEach, map, find etc.
I realised that since filter would only return objects for which the function statement was true, I didn’t need to do anything else except count the members of the resulting array with .length:
function countDevelopers(list) {
var responses = list.filter(function(object) {
return object.continent === 'Europe';
}
);
return responses.length;
}
Refactoring
I want to start using ES6 notation a bit more since it’s more concise and professional looking ;-)
Got the above code down to:
const countDevelopers = list =>
list.filter (obj => obj.continent === 'Europe').length;
Pretty pleased with myself!
Oh No!
Of course I hadn’t read the instructions properly. Wondering why the tests aren’t passing, I eventually realise that not all these devs from Europe are JavaScript devs! Doingggg!
Can I save this without a huge restructuring exercise?!
YES!
With the addition of && obj.language === 'JavaScript'.
Phew!
