With the use of my for loop looping backwards I want to get every other digit, double it and check if that number is bigger than 9. If the number is bigger than 9, I want to subtract nine from it. I want to do this in one function. Maybe use a built in function. This is what I got so far:
const validateCred = array => {
for (let i = array.length -2; i >= 0; i = i -2 ) {
let multiply = array[i] * 2;
if (multiply > 9) {
let minusNine = multiply -9;
}
}
};
Any suggestions would be a big help!
res.array.length - 1 not -2 or you will lost last one.i with -1const validateCred = array => {
const res = [];
for (let i = array.length -1; i >= 0; i = i -1 ) {
let multiply = array[i] * 2;// double it
if (multiply > 9) {//check if that number is bigger than 9
let minusNine = multiply -9;//subtract nine from it
res.push(minusNine);
}else{
res.push(array[i]); //just store as it is.
}
}
return res.reverse()
};
validateCred([10,3,40,9]);// [11, 3, 71, 9]