I am coming from Python and I am looking for a single line iterator function for any array, where I can also check a condition and return a simple change to the items.
Expected result should match the method:
function arrayEvenItemIncrement(myArray){
for (let i = 0; i < myArray.length; i++){
if (myArray[i]%2==0){
myArray[i]++;
}
}
return myArray;
}
I tried using for (i of myArray){ } but this still doesn't serve my purpose.
I think the clearest way to do what you want here would be to map to a new array instead of mutating the old one:
const arrayEvenItemIncrement = myArray =>
myArray.map((val, i) => i % 2 === 1 ? val : val + 1);
If you have to mutate the existing array, it gets significantly uglier.
const arrayEvenItemIncrement = myArray => (
myArray.forEach((val, i) => { if (i % 2 === 0) myArray[i]++; }), myArray);
or
const arrayEvenItemIncrement = myArray => {
myArray.forEach((val, i) => { if (i % 2 === 0) myArray[i]++; }); return myArray };
But I wouldn't recommend that - put it on multiple lines instead.
You can technically squeeze any JS code into a single line, but past simple manipulations, it usually isn't a good idea because it sacrifices readability, which is far more important than reducing LoC. Professional, maintainable code is not a golfing competition.
Thank you for the answers. I have settled for this:
myArray.forEach(el=>el%2===0?newArray.push(el):null);