Question

我正在尝试计算json数组的值。

如果“ beta = b”，我想计算“ sierra”数据数组中id的数量。因此，请对照设置为值“ b”的环境变量（“ B”）检查data []。beta的值。

这里的问题是我在每次数据迭代中都没有“塞拉利昂” []。

const httpPostOptions = {

    headers:
        new HttpHeaders(
            {
                'Content-Type': 'application/json; charset=utf-8',
            }),
    withCredentials: true,
};

@Injectable({
    providedIn: 'root'
})
export class Manager360CommonService {

    webApiLocation = this.getApiLocation();

    private getApiLocation() {
        const port = location.port ? ':56888' : '';
        return location.protocol + '//' + location.hostname + port;
    }

    constructor(private httpClient: HttpClient) { }



    httpGet(url: string): Observable<any> {
        return this.httpClient.get( this.webApiLocation + url, httpPostOptions)
            .pipe(map((response: Response) => {
                return response;
            }), catchError(error => {
                this.onError(error);
                return Promise.reject(error);
            }));
    }

上面的json是我在邮递员中看到的响应正文。 “循环”是我的“ for”循环的计数。

编辑1：我已经尝试过了：

{
  "data": [{
        "alpha": "a",
        "beta": "b",
        "delta": {
            "cat": "dog"
        },
        "gamma": {
            "sierra": {
                "data": [
                    {
                        "type": "alphabet",
                        "id": "a"
                    },
                    {
                        "type": "alphabet",
                        "id": "b"
                    }
                ]
            }
        }
   },
{
        "alpha": "a",
        "beta": "b",
        "delta": {
            "cat": "dog"
        },
        "bravo": {
                "data": [
                    {
                        "type": "number",
                        "id": "1"
                    },
                    {
                        "type": "number",
                        "id": "2"
                    }
                ]
            }
        }
   },
{
        "alpha": "x",
        "beta": "y",
        "delta": {
            "cat": "dog"
        },
        "gamma": {
            "sierra": {
                "data": [
                    {
                        "type": "alphabet",
                        "id": "c"
                    },
                    {
                        "type": "alphabet",
                        "id": "d"
                    }
                ]
            }
        }
   }]
}

预期：2

1. pm.response.json().data[loop].gamma.sierra.data().id).size()

2. for(var loop =0; loop < pm.response.json().data.length; loop++)
{
 if(pm.response.json().data[loop].beta===pm.variables.get("B"))
{      
        pm.response.json().data.map((item, loop) => {
            if(item.gamma){ // check if gamma key is present
                console.log(item.gamma.sierra.filter(data =>data.id 
                                                      ).length); // 
            }
        });
        result=true;
        break;

    }
}
pm.expect(true).to.eql(result);

Answer 1

您可以像这样访问它。如果您有多个数据记录，则也可以使用每个循环进行计算。

a = {
 "data": [ 
 {
        "alpha": "a",
        "beta": "b",
        "delta": {
            "cat": "dog"
        },
        "gamma": {
            "sierra": {
                "data": [
                    {
                        "type": "alphabet",
                        "id": "a"
                    },
                    {
                        "type": "alphabet",
                        "id": "b"
                    }
                ]
            }
        }
    }
]
}

console.log(a.data[0].gamma.sierra.data.length);

Answer 2

您可以采用动态方法，将要计算特定内键的对象的键移交给

。

function count(object, key, subKey) {
    const noObject = o => !o || typeof o !== 'object';

    function subCount(object) {
        if (noObject(object)) return 0;
        if (subKey in object) return 1;
        return Object.values(object).reduce((s, o) => s + subCount(o), 0);
    }

    if (noObject(object)) return 0;
    if (key in object) return subCount(object[key]);
    return Object.values(object).reduce((s, o) => s + count(o, key, subKey), 0);
}

var data = { data: [{ alpha: "a", beta: "b", delta: { cat: "dog" }, gamma: { sierra: { data: [{ type: "alphabet", id: "a" }, { type: "alphabet", id: "b" }] } } }] };

console.log(count(data, 'sierra', 'id')); // 2

Answer 3

您可以使用以下代码：

pm.response.json().data[0].gamma.sierra.data.filter( d => d.id ).length

希望有帮助。

Answer 4

pm.response.json().data.map((item, loop) => {
    if(item.beta === "b" && item.gamma){ // check if gamma key is present

        console.log(item.gamma.sierra.data.filter(data => data.id).length); // 
    }
});

Jsfiddle

如何计算数组中的值数？

4 个答案: