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Use Cases for find() and filter() in Javascript

OHIOLee answered on October 22, 2022 Popularity 1/10 Helpfulness 1/10

answer Use Cases for find() and filter() in Javascript

Use Cases for find() and filter() in Javascript

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/* When you have a use case where more than 1 element is expected to be returned
	and you want to perform operation on all elements,
    then you can use the filter() method.
    But if you expect only a single element to be returned from the array,
    then you can use find() and avoid extra iterations.
*/

// Let's look at examples of both use cases:

// 1. filter() use case example

const x = [1, 2, 3, 4, 5];

const y = x.filter(el => el%2 === 0);

console.log("y is: ", y); // y is: [2, 4]



/* In above example, filter() makes more sense as you would want to iterate over
	all elements of the array to find the elements that are divisible by 2.
*/


// 2. find() use case example

const emp = [
    {
        name: "Ram",
        empID: 101
    },
    {
        name: "Sham",
        empID: 102
    },
    {
        name: "Mohan",
        empID: 103
    }
];

const res = emp.find(el => el.empID === 102);

console.log("res is: ", res); // res is: {name: 'Sham', empID: 102}


/* In above example, find() makes more sense as there is just 1 employee who has
	102 as the empID so, find() helps to avoid iterating over the 3rd object in
    the array.
*/

Popularity 1/10 Helpfulness 1/10 Language javascript

Source: www.freecodecamp.org

Tags: javascript

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Contributed on Oct 22 2022

OHIOLee

0 Answers Avg Quality 2/10

Use Cases for find() and filter() in Javascript

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