如何在javascript中為對象鍵添加前綴？

Question

可以說我有對象：

{
  cart: 4,
  trolley: 10,
  car: 2,
}

我怎樣才能把它變成：

{
  shopping_cart: 4,
  shopping_trolley: 10,
  shopping_car: 2,
}

Answer 1

你試過什么了？

 var obj = { cart: 4, trolley: 10, car: 2 } for (var key in obj) { obj["shopping_" + key] = obj[key] delete obj[key] } console.log(obj)

Answer 2

const createPrefixObjectKeys => prefix => source => { const prefixedSourceTuples = Object.entries(source).map( ([key, value]) => [ `${prefix}${key}`, value ] ); return Object.fromEntries(prefixedSourceTuples); } // use const prefixObjectShopping = createPrefixObjectKeys('shopping_'); // where x is your object const prefixed = prefixObjectShopping(x);

Answer 3

您可以使用Object.keys()方法獲取數組中對象的鍵。 然后，您可以使用Array.reduce()方法遍歷每個鍵並創建一個具有所需前綴的新對象。

 let obj = { cart: 4, trolley: 10, car: 2, }; let pre = `shopping_`; let nObj = Object.keys(obj).reduce((a, c) => (a[`${pre}${c}`] = obj[c], a), {}); console.log(nObj)