Junior Developer Central JS Practice Exercise - 11

 

Question: 

Write a Javascript program to find the number of even digits in an array of integers. 

Answer: 

function evenArr (arr) {

let regArr = arr; 

let evenArrL = regArr.filter(i => i % 2 === 0).length; 

console.log(evenArrL); 

}

> we declare a function 'evenArr' 

> it has one parameter 'arr' 

> we create a variable 'regArr'

> it is initialized with the parameter 'arr' which is an array of integers

> we create another variable 'evenArrL'

> we initialize it with the value we get when we use the filter method on 'regArr' 

> we want to filter all the even numbers of the 'regArr' 

> to do that we use the modulo / remainder operator 

> however we only need to know the number of even digits 

> so we add the 'length' method to get the total number of even digits in the array

> finally we console.log our answer