Go from TypeScript

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calculate_price.ts

interface Item {
    label: string;
    price: number;
}

function calculatePrice(items: Item[]): number {
    let price = 0;

    for (const [_, item] of items.entries()) {
        price += item.price;
    }

    return price;
}

let items: Item[] = [
    { label: "item1", price: 10 },
    { label: "item2", price: 20 },
    { label: "item3", price: 30 }
];

let totalPrice = calculatePrice(items);

console.log(`Total price: ${totalPrice}`);

calculate_price.go

package main

import "fmt"

type Item struct {
  Label string
  Price int
}

func calculatePrice(items []Item) int {
  var price int = 0

  for _, item := range items {
    price += item.Price
  }

  return price
}

func main() {
  var items = []Item{
    {Label: "item1", Price: 10},
    {Label: "item2", Price: 20},
    {Label: "item3", Price: 30},
  }

  var totalPrice = calculatePrice(items)

  fmt.Printf("Total price: %d\n", totalPrice)
}