How to select all of a particular values of key from an array of objects

Question

so im trying to find a more efficient way to write the following code.

cartState.forEach((cart) => subTotal += cart.price);

I feel like if cartState is quite large, and becuase each cart object is quite large in itself. so purely performance or best practices is there a better way to do this?

Heres the array

const cartState = [
    {
      name: 'xxx',
      price: 'xxx',
    },
]

Just as an edit, this isn't just for adding totals, it's also for combining values into an array.

Does this answer your question? [How to find the sum of an array of numbers](https://stackoverflow.com/questions/1230233/how-to-find-the-sum-of-an-array-of-numbers) — Viet Dinh, Oct 14 '20 at 17:32
In this particular case yeah, but i will also be using it for adding values into an array if they're not numbers ie ```cartState.forEach((cart) => items.push(name));``` — Nathan Leadill, Oct 14 '20 at 17:45
You need to go through each object and access a property one way or the other. — adiga, Oct 14 '20 at 17:50

score 1 · Accepted Answer · answered Oct 14 '20 at 17:45

1

By efficient did you mean the fastest computation time or readability? If you want the fastest solution, try a for loop, because all the other options i.e. map/reduce/forEach are much slower than for loop. You can find here.

answered Oct 14 '20 at 17:45

Md Sabbir Alam

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Functionally i'd like to know the fasted comp time so thanks for that, however out of curiosity what would be best for readability? – Nathan Leadill Oct 14 '20 at 17:47
1

`reduce` would be – Beingnin Oct 14 '20 at 17:58

How to select all of a particular values of key from an array of objects

1 Answers1