How to replace specific key elements in array with elements of another array

Question

I have an array object of variable length and i want to replace specific key elements of whole array with another array object which is also of variable length. I have tried different array methods but i am stuck at this one. I have 6 months of programming experience.

My code is:

a = [
 { id: 1, name: "Alex", qty: 6, prodCode: 1321 }, 
 { id: 2, name: "carry", qty: 2, prodCode: 1641 }, 
 { id: 1, name: "manuel", qty: 7, prodCode: 1754 },
.....]

b= [{qty:5},{qty:9},{qty:2},...]
a.length===b.length

Result should be like:

[
  { id: 1, name: "Alex", qty: 5, prodCode: 1321 }, 
  { id: 2, name: "carry", qty: 9, prodCode: 1641 }, 
  { id: 1, name: "manuel", qty: 2, prodCode: 1754 },
.....]

You say the arrays are of variable length, but can we assume a.length === b.length? — shmulvad
– shmulvad, Commented Jun 10, 2020 at 15:53

GM-atteoni · Accepted Answer · 2020-06-10 15:53:38Z

3

If I understand it well, you can try this:

a.forEach((itemA, index) => {
    itemA.qty = b[index].qty
});

Hope it helps you.

answered Jun 10, 2020 at 15:53

GM-atteoni

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ABHi · Accepted Answer · 2020-06-10 16:35:08Z

0

For simplicity, this is what needs to be done

for( let index = 0; index < objectArray.length; index++ ){

   objectArray[index].qty = qtys[index].qty;

}

You can use the Browser's js console to understand where each value resides in a JSON Object and how to get a value from it.

For example, run this in the console after initializing the objectArray

objectArray[0].qty // This will give qty of the first object in the array

You can use this to navigate inside a complicated object

answered Jun 10, 2020 at 16:35

ABHi

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