How come the condition is not working?

I am given the products variable and need to create a function called rateProduct which rates the product, but if you've already rated that product you don't get to rate again. Now my code seems to be working however when I add my username the second...

Filter My Array / JSON Data Based on Multiple Criteria in JavaScript?

Hey there, I want to make people able to search an article database with multiple criteria(s). It's a little bit different to handle because: Some includes more than 1 value (like active substances: ["actSubst1", "actSubs2"]) Some values are repeati...

findIndex for older browsers

Hello I have an issue with findIndex specifically with IE11. It doesn't work! Can someone help me change this to work with IE11. var index = items.findIndex(x => x.id==id) if (index != -1) { items[index].q = items[index].q+1; ...

Create an array of objects from LocalStorage

I build an array of objects in Javascript then store that in LocalStorage. I want to now rebuild that when the user returns. So to start with: var cartItems = {}; var items = [] cartItems.items = items; I push, update as and when required. So I end u...

What is functional programming?

Lately I hear a lot about Haskell and functional programming but, to be honest, I don't know anything about it. I know about Object oriented and Procedural but I don't really understand what is functional programming all about.

What is object?