Whats this man

Read the message right before this one lol https://kotlinlang.slack.com/archives/C0922A726/p1543533286026600

But why you use log10 and stuf for rising number to an exponent

Assuming integers:

log10(5) = 0

,

log10(140) = 2

, so basically "how many powers of 10 are in there". So for 5 and 15 you have to multiply 5 by however many lots of 10 are in 15 (1) and then add 15. However I notice now that I am missing a +1 in there, so it should be

a * pow(10, log10(b) + 1) + b

For 5 and 15 this becomes:

5 * pow(10, log10(15) + 1) + 15

which is

5 * pow(10, 1 + 1) + 15

which is

5 * 100 + 15

which is

515

=> the concatenated number.