The meaning of return (i==0)

[LiBOC]

Dear all,

How would you best explain the below code fragment?

return (i == 0) ? strNum : strNum.substring(i);

Thanks alot!

[Ezzaral]

It's a simple ternary operator

condition ? true result : false result

so if i==0 it will return strNum, otherwise it returns strNum.substring(i).

[lampeter123]

Dear all,

How would you best explain the below code fragment?

return (i == 0) ? strNum : strNum.substring(i);

Thanks alot!

if (i==0) is true, then return strNum, otherwhile return strNum.substring(i)

[MoZo1]

Rewriting with if:

if (i == 0) return strNum; else return strNum.substring(i);

But the substring with the 0 parameter already returns the whole string unchanged, so it's really:

return strNum.substring(i);

And I think it's wiser to leave for the programmer that wrote the substring function to decide if it's faster to test for special values to possibly jump through the computation or it's faster to start it asap.