按递减或递增顺序按数字字段对数组 Angular 7 进行排序

Question

我需要帮助， 我需要按 PendingQuantity 字段对数组进行排序。我有负数和正数。 所以我的代码：

this.data.Products.sort(obj => obj.PendingQuantity);

所以我的数组

"Products": [
            {
                "ProductCode": "MC30180",
                "Description": "Description_1",
                "NationalCode": "N.C. 0965",
                "PendingQuantity": 20,
                "toBeScanned": true
            },
            {
                "ProductCode": "Name_2",
                "Description": "Description_2",
                "NationalCode": "N.C. 0382",
                "PendingQuantity": -3,
                "toBeScanned": false
            },
            {
                "ProductCode": "Name_3",
                "Description": "Description_3",
                "NationalCode": "N.C. 8913",
                "PendingQuantity": 25,
                "toBeScanned": false
            }
        ]

我想要的顺序是：

"Products": [
                {
                    "ProductCode": "MC30180",
                    "Description": "Description_1",
                    "NationalCode": "N.C. 0965",
                    "PendingQuantity": -3,
                    "toBeScanned": true
                },
                {
                    "ProductCode": "Name_2",
                    "Description": "Description_2",
                    "NationalCode": "N.C. 0382",
                    "PendingQuantity": 25,
                    "toBeScanned": false
                },
                {
                    "ProductCode": "Name_3",
                    "Description": "Description_3",
                    "NationalCode": "N.C. 8913",
                    "PendingQuantity": 20,
                    "toBeScanned": false
                }
            ]

Answer 1

您可以使用它来订购 asc product = product.sort((a, b) => a.PendingQuantity - b.PendingQuantity);

如果您想通过 desc 订购，请使用product = product.sort((a, b) => b.PendingQuantity - a.PendingQuantity);

更新：

如果您显示自定义顺序如-3、25、20，您可以处理排序条件。

product = product.sort((a, b) => { if (a.PendingQuantity < 0) {return -1; } if (b.PendingQuantity <0 ) {return 1;} return b.PendingQuantity - a.PendingQuantity });

let product = [
            {
                "ProductCode": "MC30180",
                "Description": "Description_1",
                "NationalCode": "N.C. 0965",
                "PendingQuantity": 20,
                "toBeScanned": true
            },
            {
                "ProductCode": "Name_2",
                "Description": "Description_2",
                "NationalCode": "N.C. 0382",
                "PendingQuantity": -3,
                "toBeScanned": false
            },
            {
                "ProductCode": "Name_3",
                "Description": "Description_3",
                "NationalCode": "N.C. 8913",
                "PendingQuantity": 25,
                "toBeScanned": false
            }
        ];
        
        
product = product.sort((a, b) => a.PendingQuantity - b.PendingQuantity);
product = product.sort((a, b) => { if (a.PendingQuantity < 0) {return -1; } if (b.PendingQuantity <0 ) {return 1;} return b.PendingQuantity - a.PendingQuantity });

console.log(product);

Answer 2

你可以使用Array的sort函数

products.sort((a,b)=> a['PendingQuantity'] - b['PendingQuantity']);