Re: lower case only first letter of word

[Ali Çehreli via Digitalmars-d-learn]

On 12/05/2017 09:25 AM, Steven Schveighoffer wrote:

Non-allocating version:

struct LowerCaseFirst(R) // if(isSomeString!R)
{
    R src;
    bool notFirst; // terrible name, but I want default false
    dchar front() {
       import std.uni: toLower;
       return notFirst ? src.front : src.front.toLower;
    }
    void popFront() { notFirst = true; src.popFront; }
    bool empty() { return src.empty; }
}

auto lowerCaseFirst(R)(R r)
{
    return LowerCaseFirst!R(r);
}

Warning: it ain't going to be fast. Auto-decoding everywhere.

-Steve

One using existing facilities:

import std.range;
import std.uni;
import std.algorithm;

auto lowerCaseFirst(R)(R r) {
    R rest = r.save;
    rest.popFront();
    return chain(r.front.toLower.only, rest);
}

unittest {
    assert(lowerCaseFirst("SchveiGoffer").equal("schveiGoffer"));
    assert(lowerCaseFirst("ŞchveıĞöffer").equal("şchveıĞöffer"));
}

void main() {
}

Ali