what are the use cases of find and findindex js array methods in Salesforce?

Hi Yogesh,

1.With findIndex() method we return the index of the first element in the array that satisfies the provided testing function.

use case of findIndex()-

-> FIND INDEX OF A FRUIT WITH FINDINDEX()
Firstly we will find the index of a fruit inside a fruit array using arrow functions:

const fruits = ["apple", "banana", "cantaloupe", "blueberries", "grapefruit"];<br/>// find the index of the "blueberries"
const index = fruits.findIndex(fruit => fruit === "blueberries");
console.log(index); // 3
console.log(fruits[index]); // blueberries
As a use case this is good when we want to find the first item that matches our condition when it exists in the array. Otherwise, it returns -1, indicating no element passed the test.

->FIND THE ODD ELEMENT WITH FINDINDEX()
Also this is another example to find the odd element inside an array:

let arr = [2, 4, 6, 8, 9, 10, 12];
// create the function to check if the item is odd
function isOdd(i) {<br/> return i % 2 !== 0;<br/>}<br/>//return the index
arr.findIndex(isOdd);

2.Using find() method we return the value of the first element in the array **that satisfies the provided testing function.

Use case of find()-

->FIND THE FRUIT OBJECT WITH FIND()
const inventory = [
{name: 'apples', quantity: 2},
{name: 'bananas', quantity: 0},
{name: 'cherries', quantity: 5}
];
// look for fruit with the name property of "cherries"
const result = inventory.find( fruit => fruit.name === 'cherries' );

console.log(result) // { name: 'cherries', quantity: 5 }
Above example shows how we can find an object inside an array using find() method looking for an object property( name here).

->FIND THE ODD ELEMENT WITH FIND() THIS TIME
let arr = [2, 4, 6, 8, 9, 10, 12];
// create the function to check if the item is odd
function isOdd(i) {<br/> return i % 2 !== 0;<br/>}<br/>//return the number this time
arr.find(isOdd);

Similar function being passed to find(0 but this time we have found the actual number.

Thanks.