Search code examples
dphobos

How to use tolower in D

I want to to put the first letter of a string into lowercase in D.

As a string is imutable in D, there doesn't seem to be a simple way.

I came up with this:

string mystr = "BookRef";
string outval = toLower( mystr[0..1] ) ~ mystr[1..$]; 
writeln( "my outval: ", outval );

Is there an easier way ?

Solution

  • While D strings are immutable, you can use char[] instead:

    char[] mystr = "BookRef".dup; // .dup to create a copy
mystr[0] = toLower(mystr[0..1])[0];
writeln("my outval: ", mystr);