Filter an array based on data from two different arrays using lodash

Question

I need to filter an array based on the data of the two different arrays. Below is the example and expected result.

let groupedProtocolFilterValues = [
    ["Risk score < 4"]
];
let groupedPatientFilterValues = [
    ["CARDIOLOGY B2 INTERN2 ADMIT PRIMARY TEAM", "CARDIOLOGY CHF INTERN2 ADMIT PRIMARY TEAM"]
];

let events = [{
    "_id": "5d087b842c3f77e7a0c674e5",
    "alert": {
        "title": "Risk score < 3",
        "patientLocation": "CARDIOLOGY CHF INTERN2 ADMIT PRIMARY TEAM\r\r\nCARDIOMYOPATHY CONSULT"
    },
    "createdAt": "2019-06-18T05:49:56.402Z"
}, {
    "_id": "5d087b842c3f77e7a0c674e6",
    "alert": {
        "title": "Risk score < 4",
        "patientLocation": "CARDIOLOGY CHF INTERN2 ADMIT PRIMARY TEAM\r\r\nCARDIOMYOPATHY CONSULT"
    },
    "createdAt": "2019-06-18T05:49:56.402Z"
}, {
    "_id": "5d087b842c3f77e7a0c674e7",
    "alert": {
        "title": "Risk score < 4",
        "patientLocation": "CARDIOLOGY CHF INTERN2 ADMIT PRIMARY TEAM\r\r\nCARDIOMYOPATHY CONSULT"
    },
    "createdAt": "2019-06-18T05:49:56.402Z"
}, {
    "_id": "5d087b842c3f77e7a0c674e8",
    "alert": {
        "title": "Risk score < 4",
        "patientLocation": "CARDIOLOGY B1 INTERN1 ADMIT PRIMARY TEAM\r\r\nCARDIOMYOPATHY CONSULT"
    },
    "createdAt": "2019-06-18T05:49:56.402Z"
}];

Here i would like to filter 'event' array based on the data of 'groupedProtocolFilterValues' and 'groupedPatientFilterValues'. So looking at the current data expected result should be

events = [{
    "_id": "5d087b842c3f77e7a0c674e6",
    "alert": {
        "title": "Risk score < 4",
        "patientLocation": "CARDIOLOGY CHF INTERN2 ADMIT PRIMARY TEAM\r\r\nCARDIOMYOPATHY CONSULT"
    },
    "createdAt": "2019-06-18T05:49:56.402Z"
}, {
    "_id": "5d087b842c3f77e7a0c674e7",
    "alert": {
        "title": "Risk score < 4",
        "patientLocation": "CARDIOLOGY CHF INTERN2 ADMIT PRIMARY TEAM\r\r\nCARDIOMYOPATHY CONSULT"
    },
    "createdAt": "2019-06-18T05:49:56.402Z"
}];

I want to check if any of the "events" array element contains "Risk score < 4" and "CARDIOLOGY B2 INTERN2 ADMIT PRIMARY TEAM" or "CARDIOLOGY CHF INTERN2 ADMIT PRIMARY TEAM".

In short i need to apply below filtration condition:

ANDING BETWEEN 'groupedPatientFilterValues/groupedProtocolFilterValues'

ORING WITHIN 'groupedPatientFilterValues' AND 'groupedProtocolFilterValue'

Is it possible to change the structure of groupedPatientFilterValues array? It would be much easier to work with array of string rather then with array of arrays. — Roman Koliada
– Roman Koliada, Commented Jun 18, 2019 at 13:17

Roman Koliada · Accepted Answer · 2019-06-18 14:02:18Z

1

It's not needed to use lodash for this task, .filter will do the work:

let groupedProtocolFilterValues = [
  ["Risk score < 4"]
];
let groupedPatientFilterValues = [
  ["CARDIOLOGY B2 INTERN2 ADMIT PRIMARY TEAM", "CARDIOLOGY CHF INTERN2 ADMIT PRIMARY TEAM"]
];

let flattenedProtocols = groupedProtocolFilterValues.reduce((res, cur) => res = res.concat(cur), []);
let flattenedLocations = groupedPatientFilterValues.reduce((res, cur) => res = res.concat(cur), []);

let events = [{
  "_id": "5d087b842c3f77e7a0c674e5",
  "alert": {
    "title": "Risk score < 3",
    "patientLocation": "CARDIOLOGY CHF INTERN2 ADMIT PRIMARY TEAM\r\r\nCARDIOMYOPATHY CONSULT"
  },
  "createdAt": "2019-06-18T05:49:56.402Z"
}, {
  "_id": "5d087b842c3f77e7a0c674e6",
  "alert": {
    "title": "Risk score < 4",
    "patientLocation": "CARDIOLOGY CHF INTERN2 ADMIT PRIMARY TEAM\r\r\nCARDIOMYOPATHY CONSULT"
  },
  "createdAt": "2019-06-18T05:49:56.402Z"
}, {
  "_id": "5d087b842c3f77e7a0c674e7",
  "alert": {
    "title": "Risk score < 4",
    "patientLocation": "CARDIOLOGY CHF INTERN2 ADMIT PRIMARY TEAM\r\r\nCARDIOMYOPATHY CONSULT"
  },
  "createdAt": "2019-06-18T05:49:56.402Z"
}, {
  "_id": "5d087b842c3f77e7a0c674e8",
  "alert": {
    "title": "Risk score < 4",
    "patientLocation": "CARDIOLOGY B1 INTERN1 ADMIT PRIMARY TEAM\r\r\nCARDIOMYOPATHY CONSULT"
  },
  "createdAt": "2019-06-18T05:49:56.402Z"
}];

const result = events.filter(x => {
  return (!flattenedProtocols.length || flattenedProtocols.indexOf(x.alert.title) >= 0) &&
    (!flattenedLocations.length || flattenedLocations.some(c => x.alert.patientLocation.includes(c)));
});
console.log(result);

edited Jun 18, 2019 at 14:02

answered Jun 18, 2019 at 13:31

Roman Koliada

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4 Comments

Bonzo Over a year ago

Problem with this solution is that if i pass groupedPatientFilterValues as an empty array, i.e. groupedPatientFilterValues = [[]] , i should get last three elements of array 'events' as a result since 'groupedProtocolFilterValues' value is "Risk score < 4".

Roman Koliada Over a year ago

It can be fixed by adding an additional check. I'll update my answer shortly.

Bonzo Over a year ago

If future if i add one more filter condition in

groupedPatientFilterValues = [ 	["CARDIOLOGY B2 INTERN2 ADMIT PRIMARY TEAM", "CARDIOLOGY CHF INTERN2 ADMIT PRIMARY TEAM"], 	["LAST_NAME, FIRST_NAME"]

suppose for name which i want to check against events.alert.name. What will be the changes i need to do. ]

Roman Koliada Over a year ago

It depends on your logic. With my approach all values inside groupedPatientFilterValues arrays are combined in single array and treated equally. So for your example events will be selected if event's patientLocation contains one of next values: CARDIOLOGY B2 INTERN2 ADMIT PRIMARY TEAM, CARDIOLOGY CHF INTERN2 ADMIT PRIMARY TEAM, LAST_NAME, FIRST_NAME. But if next pair of conditions should use some other logic then code muse be changed and only you can know how.

random · Accepted Answer · 2019-06-18 13:19:25Z

0

Instead of lodash, use filter .

let groupedProtocolFilterValues = [
  ["Risk score < 4"]
];
let groupedPatientFilterValues = [
  ["CARDIOLOGY B2 INTERN2 ADMIT PRIMARY TEAM", "CARDIOLOGY CHF INTERN2 ADMIT PRIMARY TEAM"]
];

let events = [{
  "_id": "5d087b842c3f77e7a0c674e5",
  "alert": {
    "title": "Risk score < 3",
    "patientLocation": "CARDIOLOGY CHF INTERN2 ADMIT PRIMARY TEAM\r\r\nCARDIOMYOPATHY CONSULT"
  },
  "createdAt": "2019-06-18T05:49:56.402Z"
}, {
  "_id": "5d087b842c3f77e7a0c674e6",
  "alert": {
    "title": "Risk score < 4",
    "patientLocation": "CARDIOLOGY CHF INTERN2 ADMIT PRIMARY TEAM\r\r\nCARDIOMYOPATHY CONSULT"
  },
  "createdAt": "2019-06-18T05:49:56.402Z"
}, {
  "_id": "5d087b842c3f77e7a0c674e7",
  "alert": {
    "title": "Risk score < 4",
    "patientLocation": "CARDIOLOGY CHF INTERN2 ADMIT PRIMARY TEAM\r\r\nCARDIOMYOPATHY CONSULT"
  },
  "createdAt": "2019-06-18T05:49:56.402Z"
}, {
  "_id": "5d087b842c3f77e7a0c674e8",
  "alert": {
    "title": "Risk score < 4",
    "patientLocation": "CARDIOLOGY B1 INTERN1 ADMIT PRIMARY TEAM\r\r\nCARDIOMYOPATHY CONSULT"
  },
  "createdAt": "2019-06-18T05:49:56.402Z"
}];

const output = events.filter(({
  alert: {
    title,
    patientLocation
  }
}) => {
  return groupedProtocolFilterValues[0].includes(title) && groupedPatientFilterValues[0].some((val) => {
    const patientLocationName = patientLocation.split('\n')[0];
    return val.trim().includes(patientLocationName.trim());
  });
});

console.log(output);

answered Jun 18, 2019 at 13:19

random

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1 Comment

Bonzo Over a year ago

Problem with this solution is that if i pass groupedPatientFilterValues as an empty array, i.e. groupedPatientFilterValues = [[]] , i should get last three elements of array 'events' as a result since 'groupedProtocolFilterValues' value is "Risk score < 4". Similar scenario is also for groupedProtocolFilterValues when it is empty.

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