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Lodash _.filter() Method

  • Last Updated : 06 Sep, 2020

Lodash is a JavaScript library that works on the top of underscore.js. Lodash helps in working with arrays, collection, strings, objects, numbers etc.

The _.filter() method iterates over elements of collection, returning an array of all elements predicate returns true.

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Note: This method is not similar to the _.remove() method as this method returns a new array.

Syntax:



_.filter( collection, predicate )

Parameters: This method accepts two parameters as mentioned above and described below:

  • collection: This parameter holds the collection to iterate over.
  • predicate: This parameter holds the function invoked per iteration.

Return Value: This method returns the new filtered array.

Example 1:




// Requiring the lodash library 
const _ = require("lodash"); 
      
// Original array 
var users = [
  { 'user': 'luv',
    'salary': 36000,
    'active': true },
  { 'user': 'kush'
    'salary': 40000,
    'active': false }
];
  
// Using the _.filter() method
let filtered_array = _.filter(
    users, function(o) {
       return !o.active;
    }
);
  
// Printing the output 
console.log(filtered_array);

Output:

[ { user: 'kush', salary: 40000, active: false } ]

Example 2:




// Requiring the lodash library 
const _ = require("lodash"); 
      
// Original array 
var users = [
  { 'user': 'luv',
    'salary': 36000,
    'active': true },
  { 'user': 'kush'
    'salary': 40000,
    'active': false }
];
  
// Using the _.filter() method
// The `_.matches` iteratee shorthand
let filtered_array = _.filter(users, 
    { 'salary': 36000, 'active': true }
);
  
// Printing the output 
console.log(filtered_array);

Output:

[ { user: 'luv', salary: 36000, active: true } ]

Example 3:




// Requiring the lodash library 
const _ = require("lodash"); 
      
// Original array 
var users = [
  { 'user': 'luv',
    'salary': 36000,
    'active': true },
  { 'user': 'kush'
    'salary': 40000,
    'active': false }
];
  
// Using the _.filter() method
// The `_.matchesProperty` iteratee shorthand
let filtered_array =
  _.filter(users, ['active', false]);
  
// Printing the output 
console.log(filtered_array);

Output:

[ { user: 'kush', salary: 40000, active: false } ]

Example 4:




// Requiring the lodash library 
const _ = require("lodash"); 
      
// Original array 
var users = [
  { 'user': 'luv',
    'salary': 36000,
    'active': true },
  { 'user': 'kush'
    'salary': 40000,
    'active': false }
];
  
// Using the _.filter() method
// The `_.property` iteratee shorthand
let filtered_array =
  _.filter(users, 'active');
  
// Printing the output 
console.log(filtered_array);

Output:

[ { user: 'luv', salary: 36000, active: true } ]



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