Lodash _.reject() Method
Lodash _.reject() method is the opposite of the _.filter() method and this method returns elements of the collection that predicate does not return true.
Syntax:
_.reject(collection, predicate);
Parameters:
- collection: This parameter holds the collection to iterate over.
- iteratee: This parameter holds the function invoked per iteration.
Return Value:
This method is used to return the new filtered array.
Example 1: In this example, we are printing those elements that do not match the passed parameter in the _.reject() method.
javascript
// Requiring the lodash library const _ = require( "lodash" ); // Original array let users = [ { 'user' : 'Rohit' , 'age' : 25, 'active' : false }, { 'user' : 'Mohit' , 'age' : 26, 'active' : true }]; // Use of _.reject() method let gfg = _.reject(users, function (o) { return !o.active; }); // Printing the output console.log(gfg); |
Output:
[ { user: 'Mohit', age: 26, active: true } ]
Example 2: In this example, we are printing those elements that do not match the passed parameter(object) in the _.reject() method.
javascript
// Requiring the lodash library const _ = require( "lodash" ); // Original array let users = [ { 'employee' : 'Rohit' , 'salary' : 50000, 'active' : false }, { 'employee' : 'Mohit' , 'salary' : 55000, 'active' : true } ]; // Use of _.reject() method // The `_.matches` iteratee shorthand let gfg = _.reject(users, { 'salary' : 55000, 'active' : true }); // Printing the output console.log(gfg); |
Output:
[ { employee: Rohit, salary: 50000, active: false } ]
Example 3: In this example, we are printing those elements that do not match the passed parameter(array) in the _.reject() method.
javascript
// Requiring the lodash library const _ = require( "lodash" ); // Original array let users = [ { 'employee' : 'Rohit' , 'salary' : 50000, 'active' : false }, { 'employee' : 'Mohit' , 'salary' : 55000, 'active' : true } ]; // Use of _.reject() method // The `_.matchesProperty` iteratee shorthand let gfg = _.reject(users, [ 'active' , false ]); // Printing the output console.log(gfg); |
Output:
[ { employee: Mohit, salary: 55000, active: true } ]
Example 4: In this example, we are printing those elements that do not match the passed parameter(string) in the _.reject() method.
javascript
// Requiring the lodash library const _ = require( "lodash" ); // Original array let users = [ { 'employee' : 'Rohit' , 'salary' : 50000, 'active' : false }, { 'employee' : 'Mohit' , 'salary' : 55000, 'active' : true } ]; // Use of _.reject() method // The `_.property` iteratee shorthand let gfg = _.reject(users, 'active' ); // Printing the output console.log(gfg); |
Output:
[ { employee: Rohit, salary: 50000, active: false } ]