The Lodash _.filter() method iterates over a collection (array or object) and returns a new array of elements that meet a specified condition (predicate), enabling efficient data filtering and extraction.
Note: This method is not similar to the _.remove() method as this method returns a new array.
Syntax:
_.filter( collection, predicate )Parameters:
- collection(Array|Object) parameter holds the collection to iterate over.
- predicate(Function) parameter holds the function invoked per iteration.
Return Value:
This method returns the new filtered array.
Example 1: In this example, we are printing the user whose active is false by the use of the function. so we are passing the function in the _.filter() method.
// Requiring the lodash library
const _ = require("lodash");
// Original array
let 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: In this example, we are printing the user whose active is true by the use of the object. so we are passing the object in the _.filter() method.
// Requiring the lodash library
const _ = require("lodash");
// Original array
let 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: In this example, we are printing the user whose active is false by the use of the array. so we are passing the array in the _.filter() method.
// Requiring the lodash library
const _ = require("lodash");
// Original array
let 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: In this example, we are printing the user who has active property. so we are passing the active property in the _.filter() method.
// Requiring the lodash library
const _ = require("lodash");
// Original array
let 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 } ]