Javascript array search filter

Question

I have the scenario, with provided example JSON data:

[{
   "name": "Joe",
   "age": "28",
   "hobby": ["Reading", "Chilling", "Cycling"]
},
{
   "name": "Beck",
   "age": "25",
   "hobby": ["Drinking", "Cycling"]
},
{
   "name": "Candace",
   "age": "24",
   "hobby": ["Reading", "Singing"]
}]

Let's say the array above are shown in some list in web page.

I have 2 (two) search dropdown with multiple selection to search name and age.

For name, let's say it shows all distinct hobbies (Reading, Chilling, Cycling, Drinking, Singing).
For age, let's say it have 2 options for age range: 23-26 and > 27.

For searching hobby, my code is (in ReactJS):

filteredPersons = this.state.personList.filter( person =>{
  return person.hobby.some(v=> filterHobby.indexOf(v) !== -1)
});

which is:

personList is list of array from JSON above;
filterHobby is list of array from multiple select, ex: if filterHobby = ["Reading","Singing"], it will show Joe and Candace.

The question is, how can I search for age with multiple selection?

Expected result:

Choose 23-26 only will show Beck and Candace
Choose >27 only will show Joe
Choose both will show Beck, Candace and Joe

Thank you for any answer.

In a first step map the selected age range to an appropriate filter function (I'd suggest not doing magic here, a simple switch or similar... [readability; can be extracted/*magic-ified* later if it gets too complex]), then apply that filter function similar to what you do with filterHobby. — Yoshi
– Yoshi, Commented Feb 14, 2020 at 9:27

Nina Scholz · Accepted Answer · 2020-02-14 09:29:26Z

1

You could take an object with all filters and another for keeping function for getting the ages of the objects.

var data = [{ name: "Joe", age: "28", hobby: ["Reading", "Chilling", "Cycling"] }, { name: "Beck", age: "25", hobby: ["Drinking", "Cycling"] }, { name: "Candace", age: "24", hobby: ["Reading", "Singing"] }],
    functions = {
        '23-26': ({ age }) => age >= 23 && age <= 26,
        '>27': ({ age }) => age > 27
    },
    filters = {
        hobby:  ["Reading", "Cycling"],                
        age: ['23-26']
    },
    result = data.filter(o =>  
        filters.hobby.some(v => o.hobby.includes(v)) &&
        filters.age.some(fn => functions[fn](o))
    );

console.log(result);

.as-console-wrapper { max-height: 100% !important; top: 0; }

answered Feb 14, 2020 at 9:29

Nina Scholz

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Comments

Alexander B. · Accepted Answer · 2020-02-14 09:21:23Z

0

You need use filter function for filtering an array.

We have an array with persons:

const persons = [
    {
       "name": "Joe",
       "age": "28",
       "hobby": ["Reading", "Chilling", "Cycling"]
    },
    {
       "name": "Beck",
       "age": "25",
       "hobby": ["Drinking", "Cycling"]
    },
    {
       "name": "Candace",
       "age": "24",
       "hobby": ["Reading", "Singing"]
    }
]

And then we will filter that array:

persons.filter((person) => {
    return person.age > 27;
})

This code returns us Joe's info:

[
  {
    "name": "Joe",
    "age": "28",
    "hobby": ["Reading", "Chilling", "Cycling"]
  }
]

answered Feb 14, 2020 at 9:21

Alexander B.

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Comments

rajan tank · Accepted Answer · 2020-02-14 09:33:06Z

0

For search person by its age, you can make an array of a selected age like this.

let ages = ['23','24','25'];

code like this

persons.filter(item=> {return ages.indexOf(item.age)!== -1 })

this return person array which are matches in ages array

output:

[
  { name: 'Beck', age: '25', hobby: [ 'Drinking', 'Cycling' ] },
  { name: 'Candace', age: '24', hobby: [ 'Reading', 'Singing' ] }
]

answered Feb 14, 2020 at 9:33

rajan tank

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Comments

Ramesh Reddy · Accepted Answer · 2020-02-14 09:39:35Z

0

ageFilters = ['23-26','>27']
selectedFilter = '23-26';

filteredPersons = this.state.persons.filter(({age}) => {
 const _age = parseInt(age);
 if(selectedFilter === '23-26') {             // "23-26"
  return (_age>=23) && (_age<=26);
 } else if(selectedFilter === '>27') {                          // "27"
  return (_age>27);
 } else {
  return true;
 }
})

edited Feb 14, 2020 at 9:39

answered Feb 14, 2020 at 9:24

Ramesh Reddy

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4 Comments

joshua14 Over a year ago

my dropdown value will be single array (like filterHobby described above) and i actually confused the value for each option. maybe like: filterAge = ["23-26", ">27"] (?)

Ramesh Reddy Over a year ago

in that array one value will be selected by the user right? use that as the condition for checking.

joshua14 Over a year ago

sorry, single array with multiple value, the selectedFilter can be multiple.

Ramesh Reddy Over a year ago

Okay, in that case, you can use nina's solution...Even if I edit my answer my approach will be similar.

Fyodor Yemelyanenko · Accepted Answer · 2020-02-14 10:12:01Z

0

You may create additional function ageComparer for convenience

const ageComparer = (ageRange, age) => (ageRange === '23-26' ? (age >= 23 && age <= 26) : age >=27)

And then utilize it during filtering

// ageFilter will be taken from drom down
const ageFilter = ['23-26'];

person.filter(p => p.hobby.some(v=> filterHobby.indexOf(v) !== -1) && ageFilter.some(a => ageComparer(a, +p.age)))

edited Feb 14, 2020 at 10:12

answered Feb 14, 2020 at 9:28

Fyodor Yemelyanenko

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2 Comments

joshua14 Over a year ago

the ageFilter can be multiple (array)

Fyodor Yemelyanenko Over a year ago

Sure! Updated the answer for ageFilter to be an array.

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