Javascript 数组搜索过滤器

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.

Answer 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; }

Answer 2

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"]
  }
]

Answer 3

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;
 }
})

Answer 4

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)))

Answer 5

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' ] }
]