Re: Missing array element

[Biotronic via Digitalmars-d-learn]

On Wednesday, 30 August 2017 at 06:16:16 UTC, Vino.B wrote:

On Tuesday, 29 August 2017 at 18:39:03 UTC, Ali Çehreli wrote:

https://dlang.org/phobos/std_algorithm_setops.html#.setDifference



 I tried the setDifference but does seem to be working as 
expected


From the documentation of setDifference: "The two ranges are 
assumed to be sorted by less."


In other words, you will need to sort your ranges first. Either 
pre-sort them as


string[] a = ["test1", "test2", "test3", "test4"];
string[] b = ["test2", "test4"]';

or call setDifference(a.sort(), b.sort()).

--
  Biotronic

Re: Missing array element

[Vino.B via Digitalmars-d-learn]

On Tuesday, 29 August 2017 at 18:39:03 UTC, Ali Çehreli wrote:

On 08/29/2017 11:20 AM, Vino.B wrote:


string[] a = ["test1", "test2", "test4"];
string[] b = ["test2", "test4"];



Required output: "test1"


You're looking for setDifference:

  
https://dlang.org/phobos/std_algorithm_setops.html#.setDifference


Ali


Hi,

 I tried the setDifference but does seem to be working as expected

import std.stdio, std.array, std.algorithm;
string[] a = ["test4", "test3", "test2", "test1"];
string[] b = ["test2", "test4"];
void main ()
{
auto m = setDifference(a,b);
writeln(m);
}

Output : Required output ["test3", "test1"]

["test3", "test2", "test1"]

From,
Vino.B

Re: Missing array element

[Ali Çehreli via Digitalmars-d-learn]

On 08/29/2017 11:20 AM, Vino.B wrote:


string[] a = ["test1", "test2", "test4"];
string[] b = ["test2", "test4"];



Required output: "test1"


You're looking for setDifference:

  https://dlang.org/phobos/std_algorithm_setops.html#.setDifference

Ali

Re: Missing array element

[Francis Nixon via Digitalmars-d-learn]

On Tuesday, 29 August 2017 at 18:20:38 UTC, Vino.B wrote:

Hi,

 Can any one help me on the below program, as I need the 
missing element for array "a" to be printed when compared with 
array "b"


Program:

import std.stdio, std.array, std.algorithm;
string[] a = ["test1", "test2", "test4"];
string[] b = ["test2", "test4"];
void main ()
{
auto m = mismatch(a,b);
writeln(m[0]);
writeln(m[1]);
}

Output:
["test1", "test2", "test4"]
["test2", "test4"]

Required output: "test1"

From,
Vino.B


The mismatch function doesn't work how your expecting it to. It 
compares the ith element in a with the ith element in b, until 
they encounter an element that is not equal. It then returns all 
elements including and beyond i, for both arrays. In this case 
the first element does not match, and therefore it returns the 
entire contents of both arrays.

Missing array element

[Vino.B via Digitalmars-d-learn]

Hi,

 Can any one help me on the below program, as I need the missing 
element for array "a" to be printed when compared with array "b"


Program:

import std.stdio, std.array, std.algorithm;
string[] a = ["test1", "test2", "test4"];
string[] b = ["test2", "test4"];
void main ()
{
auto m = mismatch(a,b);
writeln(m[0]);
writeln(m[1]);
}

Output:
["test1", "test2", "test4"]
["test2", "test4"]

Required output: "test1"

From,
Vino.B