Filtering an array of objects by their attributes

Question

Filtering an array of objects by their attributes

How can I efficiently filter an array of objects by a specific value that could be located in any property?

Consider the following object:

var x = [
    {
        name: "one",
        swp: "two"
    },
    {
        name: "two",
        swp: "three"
    },
    {
        name: "aa",
        swp: "bb"
    }
];

Using Array.prototype.filter, I could do:

x.filter(function(y){ return y.name == "two"; });

However, this would only return one object out of the two that have "two" as a value in any property.

On the other hand, the following function:

function findValue( value ) {
  var y = [];
  for (obj in x) {
    for (val in x[obj]) {
      if (x[obj][val].match( value )) {
        y.push(x[obj]);
      }
    }
  }
  return y;
}

accomplishes the task, but it is a brute force method. Is there a more efficient way to achieve the same result?

javascript arrays object

Answer 1

Answer №1

const data = []; // array of objects to filter
const property = 'something';

const filteredData = data.filter(obj => Object.keys(obj).some(key => obj[key] === property));

If you require compatibility across different browsers or are not using babel, you can use the ES5 version of the code snippet above. It combines the functionalities of Array.prototype.filter and Array.prototype.some to filter out elements from the array based on a specific condition.

var data = []; // array of objects to filter
var property = 'something';

var filteredData = data.filter(function(obj) { 
  return Object.keys(obj).some(function(key) { 
    return obj[key] === property; 
  });
});

Answer 2

const data = []; // array of objects to filter
const property = 'something';

const filteredData = data.filter(obj => Object.keys(obj).some(key => obj[key] === property));

If you require compatibility across different browsers or are not using babel, you can use the ES5 version of the code snippet above. It combines the functionalities of Array.prototype.filter and Array.prototype.some to filter out elements from the array based on a specific condition.

var data = []; // array of objects to filter
var property = 'something';

var filteredData = data.filter(function(obj) { 
  return Object.keys(obj).some(function(key) { 
    return obj[key] === property; 
  });
});

Answer 3

Answer №2

One approach is to integrate the for..in loop with the .filter() function:

let array = [{name: "one", swp: "two"}, {name: "two", swp: "three"}, { name: "aa", swp: "bb"}];

let filteredArray = array.filter(function(element) {
  for (let key in element)
    if (element[key] === "two") return true;
});
console.log(filteredArray);

Answer 4

One approach is to integrate the for..in loop with the .filter() function:

let array = [{name: "one", swp: "two"}, {name: "two", swp: "three"}, { name: "aa", swp: "bb"}];

let filteredArray = array.filter(function(element) {
  for (let key in element)
    if (element[key] === "two") return true;
});
console.log(filteredArray);

Answer 5

Answer №3

Implement an inner loop technique to verify each property's value

let valueToCheck ="one";
let result = data.filter(function(element){
     return Object.keys(element).some(function(property){
         return element[property] === valueToCheck;
     });
});

Answer 6

Implement an inner loop technique to verify each property's value

let valueToCheck ="one";
let result = data.filter(function(element){
     return Object.keys(element).some(function(property){
         return element[property] === valueToCheck;
     });
});

Filtering an array of objects by their attributes

Answer №1

Answer №2

Answer №3

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