• Freddy (9/9) Oct 18 2015 How do you call startsWith with only a predicate
• Meta (8/17) Oct 18 2015 Is this a simplified use case of some actual code you have?
• Freddy (2/9) Oct 18 2015 It's simplified, i wanted to check for empty
• Jonathan M Davis via Digitalmars-d-learn (6/15) Oct 18 2015 startsWith doesn't have an overload that takes only a predicate. The
• =?UTF-8?B?Tm9yZGzDtnc=?= (3/9) Oct 19 2015 https://github.com/D-Programming-Language/phobos/pull/3752
• =?UTF-8?B?Tm9yZGzDtnc=?= (2/3) Jan 27 2016 Is merged now!

Freddy <Hexagonalstar64 gmail.com> writes:

How do you call startsWith with only a predicate
---
import std.algorithm;
import std.ascii;

bool iden(string str)
{
     return str.startsWith!(a => a.isAlpha || a == '_');
}
---

Meta <jared771 gmail.com> writes:

On Sunday, 18 October 2015 at 17:48:20 UTC, Freddy wrote:
 How do you call startsWith with only a predicate
 ---
 import std.algorithm;
 import std.ascii;

 bool iden(string str)
 {
     return str.startsWith!(a => a.isAlpha || a == '_');
 }
 ---

Is this a simplified use case of some actual code you have? 
Otherwise, you can just do:


bool iden(string str)
{
     auto f = str.front;
     return f.isAlpha || f == '_';
}

Freddy <Hexagonalstar64 gmail.com> writes:

On Sunday, 18 October 2015 at 17:58:30 UTC, Meta wrote:
 Is this a simplified use case of some actual code you have? 
 Otherwise, you can just do:


 bool iden(string str)
 {
     auto f = str.front;
     return f.isAlpha || f == '_';
 }

It's simplified, i wanted to check for empty

Jonathan M Davis via Digitalmars-d-learn writes:

On Sunday, October 18, 2015 17:48:18 Freddy via Digitalmars-d-learn wrote:
 How do you call startsWith with only a predicate
 ---
 import std.algorithm;
 import std.ascii;

 bool iden(string str)
 {
      return str.startsWith!(a => a.isAlpha || a == '_');
 }
 ---

startsWith doesn't have an overload that takes only a predicate. The
existing overloads all require at least one "needle" to search for in the
"haystack." An overload that doesn't require a needle could certainly be
added, but there isn't one right now.

- Jonathan M Davis

=?UTF-8?B?Tm9yZGzDtnc=?= <per.nordlow gmail.com> writes:

On Sunday, 18 October 2015 at 21:44:57 UTC, Jonathan M Davis 
wrote:
 startsWith doesn't have an overload that takes only a 
 predicate. The existing overloads all require at least one 
 "needle" to search for in the "haystack." An overload that 
 doesn't require a needle could certainly be added, but there 
 isn't one right now.

 - Jonathan M Davis

https://github.com/D-Programming-Language/phobos/pull/3752

=?UTF-8?B?Tm9yZGzDtnc=?= <per.nordlow gmail.com> writes:

On Monday, 19 October 2015 at 19:20:15 UTC, Nordlöw wrote:
 https://github.com/D-Programming-Language/phobos/pull/3752

Is merged now!