獲取javascript中兩個對象數組之間匹配元素的索引

Question

我有兩個對象數組。 我想從數組 2 中獲取匹配元素的索引。如何找到它？

這是一個例子。

數組 1

selectedProduct: [{id:2, name:"product 1", category:"home"}]

陣列 2

allProducts: [{id:1, name:"product 3", category:"grocery"},
             {id:2, name:"product 1", category:"home"},{id:3, name:"product 4",category:"vegetables"}]

代碼片段：

const index = this.allProducts.findIndex(item => this.selectedproduct.filter(entry => entry.id === item.id))

但是，它返回 0。我怎樣才能得到匹配元素的索引？

Answer 1

改用some ：

 let selectedProduct = [ {id:2, name:"product 1", category:"home"} ]; let allProducts = [ {id:1, name:"product 3", category:"grocery"}, {id:2, name:"product 1", category:"home"}, {id:3, name:"product 4",category:"vegetables"} ] const index = allProducts.findIndex(item => selectedProduct.some(entry => entry.id === item.id)); console.log(index);