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Eric Brennan
14,490 PointsCan I use const and let instead of var with AJAX?
I went through the ES2015 js course here on treehouse teaching the const and let variables and how they're much better than var. Then I move on to the AJAX course and when I attempt to use these variables in the code challenges, I get syntax errors, and messages that say "it's always best to use var". I'm really confused because the previous courses said the complete opposite. Is it just a matter of updating the js syntax in the challenges with ES2015? I notice that the function shorthand () => {} doesn't work either. Or is this preference of "var" specific to JSON or AJAX?
1 Answer
Rich Donnellan
Treehouse Moderator 27,671 PointsMy guess is the AJAX course is pre-ES2015. The challenges are very specific to what content is provided, so I'd just stick to using var to pass. However, using const, let, and arrow functions can be used in "the real world".
Bryan Reed
11,747 PointsBryan Reed
11,747 PointsTo add to Rich's answer, ES6 requires a compiler such as Babel so unless it's explicitly set up in the real world to take ES6 or in Treehouse expect to have to use var and normal functions.
You can test out ES6 here: https://babeljs.io/repl/
Rich Donnellan
Treehouse Moderator 27,671 PointsRich Donnellan
Treehouse Moderator 27,671 PointsGreat addition.
Eric Brennan
14,490 PointsEric Brennan
14,490 PointsThanks Rich & Bryan. Makes perfect sense