@ahmed_gameel/iseven/index.js

function that checks if a number is even or not

module.exports  = (num)=>{
    if (typeof num!=='number' ){
        return undefined
    }
    if (num===0){
        return null
    }
    let result = Math.pow(-1, num);
    if (result > 0){
        return true
    } else {
        return false
    }
}