The nearest ten

Problem

Write a function that takes a whole number, 0 or bigger, and moves it to the nearest ten: 43 stays at 40 and 47 goes up to 50.

The one that lands right in the middle goes up: 25 gives 30, not 20. And 3 is closer to 0 than to 10, so it gives 0.

Examples

• 43 → 40

• 47 → 50

• 100 → 100

Besides these, the challenge has hidden tests that are revealed when you submit your solution.

You start with this

def round_to_ten(n):
    pass

function roundToTen(n) {
}