ES6 Arrow functions with find and findindex function

Array Function: find() and findIndex()

ES6 introduced 2 new methods to search for elements inside the Array. ES6 is different version of the ECMAScript specification. Which is the standard that defines the scripting language that javascript is based on.

ES6 release on 2015 and there are so many features Arrow function, classes, let and const for variables.


find() - It is used to search for an element in the array that matches some condition. It returns the first element that matches the condition.


findIndex() - It is quite similar to the find() method. The difference is that findIndex() method returns the index of the element instead of the element itself.

Example

Here written code says that if our condition are matches or true condition then it returns the first element. If you want in replace of return true you can write any if, else condition or write even or odd conditon.

const numArr = [-1, -2, -3, -4, 1, 2, 3, 4]

const result = numArr.find(item => {
    return true;
})


console.log('Result => ', result);


 

 Output

Example (return False)

if we return false statement then output is undefined...

Example

Let's take another example of even - odd condition for returning the matches array elements.

return item % 2 === 0; 

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