How to Find & Update Values in an Array of Objects using Lodash ?
Last Updated :
18 Jul, 2024
To find and update values in an array of objects using Lodash, we employ utility functions like find or findIndex to iterate over the elements. These functions facilitate targeted updates based on specific conditions, enhancing data manipulation capabilities.
Run the below command to install Lodash:
npm i lodash
Using find and assign Functions
In this approach, we are using Lodash's find function to locate the object with an id equal to 102 in the courses array. Then, we use the assign method to update its duration property to '10 weeks', demonstrating a targeted find-and-update operation in an array of objects using Lodash.
Example: The below example uses find and assign functions to find and update values in an array of objects using lodash.
JavaScript
const _ = require('lodash');
let courses = [{
id: 101,
name: 'Programming with Python',
duration: '4 weeks'
},
{
id: 102,
name: 'Data Structures and Algorithms',
duration: '6 weeks'
},
{
id: 103,
name: 'Web Development with JavaScript',
duration: '8 weeks'
}
];
let courseToUpdate = _.find(courses, {
id: 102
});
if (courseToUpdate) {
_.assign(courseToUpdate, {
duration: '10 weeks'
});
}
console.log(courses);
Output:
[
{ id: 101, name: 'Programming with Python', duration: '4 weeks' },
{
id: 102,
name: 'Data Structures and Algorithms',
duration: '10 weeks'
},
{
id: 103,
name: 'Web Development with JavaScript',
duration: '8 weeks'
}
]
Using findIndex Function
In this approach, we use _.findIndex to locate the index of the object with an id equal to 3 in the student's array. Then, we update the score property of that object to 80 if the index is found, demonstrating a targeted find-and-update operation using Lodash's findIndex function.
Example: The below example uses findIndex to find and update values in an array of objects using lodash.
JavaScript
const _ = require('lodash');
let students = [{
id: 1,
name: 'Gaurav',
score: 85
},
{
id: 2,
name: 'Ramesh',
score: 92
},
{
id: 3,
name: 'Prakash',
score: 78
}
];
let indexToUpdate = _.findIndex(students, {
id: 3
});
if (indexToUpdate !== -1) {
students[indexToUpdate].score = 80;
}
console.log(students);
Output:
[
{ id: 1, name: 'Gaurav', score: 85 },
{ id: 2, name: 'Ramesh', score: 92 },
{ id: 3, name: 'Prakash', score: 80 }
]
Using map Function
In this approach, we use the _.map function from Lodash to iterate over the array of objects and create a new array with updated values based on a specified condition. This approach is useful for making updates and returning a new array without mutating the original array.
Example: The below example uses map to find and update values in an array of objects using lodash.
JavaScript
const _ = require('lodash');
let employees = [{
id: 1,
name: 'Nikunj',
salary: 5000
},
{
id: 2,
name: 'Dhruv',
salary: 6000
},
{
id: 3,
name: 'Yash',
salary: 7000
}
];
let updatedEmployees = _.map(employees, (employee) => {
if (employee.id === 2) {
return _.assign({}, employee, { salary: 6500 });
}
return employee;
});
console.log(updatedEmployees);
Output:
[
{ id: 1, name: 'Nikunj', salary: 5000 },
{ id: 2, name: 'Dhruv', salary: 6500 },
{ id: 3, name: 'Yash', salary: 7000 }
]
Using forEach Function
In this approach, we use the _.forEach function from Lodash to iterate over the array of objects and directly update the values in the original array based on a specified condition. This approach is useful for in-place updates.
Example:
JavaScript
const _ = require('lodash');
let products = [
{ id: 1, name: 'Laptop', price: 1000 },
{ id: 2, name: 'Phone', price: 500 },
{ id: 3, name: 'Tablet', price: 300 }
];
_.forEach(products, (product) => {
if (product.id === 2) {
product.price = 550;
}
});
console.log(products);
Output:
[
{ id: 1, name: 'Laptop', price: 1000 },
{ id: 2, name: 'Phone', price: 550 },
{ id: 3, name: 'Tablet', price: 300 }
]
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