• pascal111 (10/10) Aug 09 2022 I tried to copy an array into another without affecting in the
• Paul Backus (9/20) Aug 09 2022 A simpler way to do this is to use the array's built-in .dup
• pascal111 (3/26) Aug 09 2022 I don't know how I forgot this or why it didn't come to my mind
• pascal111 (1/1) Aug 09 2022 Edit "Copying an array into another" in the title.

pascal111 <judas.the.messiah.111 gmail.com> writes:

I tried to copy an array into another without affecting in the 
original array when I try to change the value of any element of 
the new array, but I failed except with this way in the next code:

'''D
int[] x=[1,2,3];
     int[] y=x.filter!("a==a").array;

     y[1]=800;

     x.writeln;
     y.writeln;
'''

Paul Backus <snarwin gmail.com> writes:

On Tuesday, 9 August 2022 at 18:33:04 UTC, pascal111 wrote:
 I tried to copy an array into another without affecting in the 
 original array when I try to change the value of any element of 
 the new array, but I failed except with this way in the next 
 code:

 '''D
 int[] x=[1,2,3];
     int[] y=x.filter!("a==a").array;

     y[1]=800;

     x.writeln;
     y.writeln;
 '''

A simpler way to do this is to use the array's built-in .dup 
method [1]:

     int[] x = [1, 2, 3];
     int[] y = x.dup;
     y[1] = 800;

     writeln(x); // [1, 2, 3]
     writeln(y); // [1, 800, 3]

[1] https://dlang.org/spec/arrays.html#array-properties

pascal111 <judas.the.messiah.111 gmail.com> writes:

On Tuesday, 9 August 2022 at 18:41:52 UTC, Paul Backus wrote:
 On Tuesday, 9 August 2022 at 18:33:04 UTC, pascal111 wrote:
 I tried to copy an array into another without affecting in the 
 original array when I try to change the value of any element 
 of the new array, but I failed except with this way in the 
 next code:

 '''D
 int[] x=[1,2,3];
     int[] y=x.filter!("a==a").array;

     y[1]=800;

     x.writeln;
     y.writeln;
 '''

 A simpler way to do this is to use the array's built-in .dup 
 method [1]:

     int[] x = [1, 2, 3];
     int[] y = x.dup;
     y[1] = 800;

     writeln(x); // [1, 2, 3]
     writeln(y); // [1, 800, 3]

 [1] https://dlang.org/spec/arrays.html#array-properties

I don't know how I forgot this or why it didn't come to my mind 
because I already indeed had read about ".dup"?! You are right!

pascal111 <judas.the.messiah.111 gmail.com> writes:

Edit "Copying an array into another" in the title.