Not exactly one line, but this works for all the combinations I could think
of:
function incTo x,i -- increments x to the next i
if i = 0 then
return x
else if x mod i <> 0 and x * i < 0 then
return x div i * i
else
return x div i * i + i
end if
end incTo
Here's my test results. First column is x, second is i, third is expected
result, fourth is actual result, fifth is whether test passed:
30 20 40 40 true
20 20 40 40 true
30 -20 20 20 true
40 -20 20 20 true
-30 20 -20 -20 true
-20 20 0 0 true
-30 -20 -40 -40 true
-20 -20 -40 -40 true
0 20 20 20 true
0 -20 -20 -20 true
-30 0 -30 -30 true
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