Node.js Important Array Programs

#1 Make a function that will take an array with number as the first argument and another number as a second argument and it should return all numbers below the second argument number.

function Arr(arr, ele){
    for(let i=0; i<=arr.length; i++){
        if(arr[i] == ele){
            for(let j=i; j<=arr.length; i++){
                if(i<=4){
                    console.log(arr[i])
                }
                else{
                    break;
                }
            }
        }
    }
}
Arr([1, 2, 3, 4, 5],3);

3
4
5

#2 Make a function that will take an array of any data type as first argument and second argument will be a variable to find in the array. If not found, it should return -1 otherwise it should return the index.

function checkArray(arr, ele){
    for(let i=0; i<=arr.length; i++){
        
        if(arr[i] == ele){
            return i;
        }
    }
    return -1;
}
//console.log(checkArray([1, 2, 3, 4, 5],3)); // output = 2
console.log(checkArray([1, 2, 3, 4, 5],6)); // output = -1

-1

#3 Make a function that will take an array with numbers as an argument and return another array with all the numbers doubled.

function double (arr){
    let newArr = [];
    for(let i = 0; i < arr.length; i++){
        newArr.push(arr[i] * 2);
    }
    console.log(newArr) ;
}
double([3,4,5]);

Output:

[ 6, 8, 10 ]