Lodash _.every() method checks if the predicate returns true for all elements of the collection and iteration is stopped once the predicate returns falsely.
Note: Also this method returns true for empty collections because everything is true for elements of empty collections.
Syntax:
_.every(collection, [predicate=_.identity]);
Parameters:
- collection (Array|Object): This parameter holds the collection to iterate over.
- [predicate=_.identity] (Function): This parameter holds the function invoked per iteration.
Return Value:
This method is used to return true if all elements pass the predicate check, else false.
Example 1: In this example, we are checking is every element of the given array has that data type or not and printing the result by the use of the _.every() method.
javascript
// Requiring the lodash library const _ = require("lodash");// Original array let obj1 = ([true, 1, null, 'yes']);let obj2 = ([true, 2, 'active', 'yes']);// Use of _.every() methodlet x = _.every(obj1, Boolean);let y = _.every(obj2, Boolean);// Printing the output console.log(x);console.log(y); |
Output:
false
true
Example 2: In this example, we are checking is every element of the given array has that same object or not and printing the result by the use of the _.every() method.
javascript
// Requiring the lodash library const _ = require("lodash");// Original array let users = [{ 'user': 'jonny', 'age': 30, 'active': false },{ 'user': 'harry', 'age': 35, 'active': false }];// Use of _.every() method// The `_.matches` iteratee shorthand.let x = _.every(users, { 'user': 'barney', 'active': false });// Printing the output console.log(x); |
Output:
false
Example 3: In this example, we are checking is every element of the given array of objects has that same field or not and printing the result by the use of the _.every() method.
javascript
// Requiring the lodash library const _ = require("lodash");// Original array let users = [ { 'user': 'jonny', 'age': 30, 'active': false }, { 'user': 'harry', 'age': 35, 'active': false }];// Use of _.every() method// The `_.matchesProperty` iteratee shorthand.let x = _.every(users, ['active', false]);// Printing the output console.log(x); |
Output:
true
Example 4: In this example, we are checking is every element of the given array of objects has that string or not and printing the result by the use of the _.every() method.
javascript
// Requiring the lodash library const _ = require("lodash");// Original array let users = [ { 'user': 'jonny', 'age': 30, 'active': false }, { 'user': 'harry', 'age': 35, 'active': false }];// Use of _.every() method// The `_.property` iteratee shorthand.let x = _.every(users, 'active');// Printing the output console.log(x); |
Output:
false
