How to update a single item inside repeatable component using id of that item

Discord Q&A strapi-questions
1

I have this repeatable Variants component inside Product and I want to update a single variant or item using its id

I am trying like this

    const updatedVariants = item.product.Variants.map((variantInMap) => {
      if (variantInMap.id === variant.id) {
        return {
          ...variantInMap,
          Quantity: variantInMap.Quantity - item.Quantity,
        };
      }
      return variantInMap;
    });

    const res = await strapi.entityService.update(
      "api::product.product",
      item.product.id,
      {
        data: {
          Variants: updatedVariants,
        },
      }
    );
    console.log(res);

But with this I cant provide the updated Variants to next iteration

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2

For components you need to give it all information else it will delete the old repeated function