Lodash _.find() Method

The Lodash _.find() method searches through a collection (array or object) and returns the first element that satisfies a specified condition (predicate). It’s useful for quickly locating a matching item within a collection. If no match is found, it returns undefined.

Syntax

_.find(collection, predicate, [fromIndex=0])

Parameters:

• collection: This parameter holds the array or object collection that needs to be inspected.
• predicate: This parameter holds the function invoked in each iteration.
• fromIndex: This parameter holds the index from which you want to start searching (optional). By default it's 0. 

Return Value:

It returns the matched element or undefined if nothing matches.

Example: In this example, we are passing the array and a function in the _.find() method which returns the matched first value.

const _ = require('lodash');
let x = [2, 5, 7, 10, 13, 15];

let result = _.find(x, function (n) {
    if (n * n < 100) {
        return true;
    }
});

console.log(result);

Output:

2

Example 2: In this example, we will search for the first student (object) in the list who has more scores than 90.  

const _ = require('lodash');

let x = [
    { 'name': 'Akhil', marks: '78' },
    { 'name': 'Akhil', marks: '98' },
    { 'name': 'Akhil', marks: '97' }
];

let result = _.find(x, function (obj) {
    if (obj.marks > 90) {
        return true;
    }
});

console.log(result);

Output:  

{name: 'Akhil', marks: '98' }

Example 3: In this example, we are getting 'undefined' as there is no matched value present in the array according to the function.

const _ = require('lodash');

let x = [1, 2, 7, 10, 13, 15];

let result = _.find(x, function (n) {
    if (n < 0) {
        return true;
    }
});

console.log(result);

Output: 

undefined