D Documentation  
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  1. Introduction
    1. A simple tutorial
    2. Switching to D
    3. An advanced tutorial
  2. Language Reference
    1. General syntax
    2. Statements
    3. Types
      1. void
      2. bit
      3. Integer data types
      4. Floatingpoint data types
      5. Character data types
      6. Derived data types
        1. Arrays
          1. Properties
          2. Concatenation
          3. Slicing
          4. Copying
          5. Operations
      7. User Defined Types
      8. Delegates
    4. Error Handling
    5. Memory Management
  3. Std. runtime library (Phobos)
    1. std.base64
    2. std.boxer
    3. std.compiler
    4. std.conv
    5. std.ctype
    6. std.date
    7. std.file
    8. std.format
    9. std.gc
    10. std.intrinsic
    11. std.math
    12. std.md5
    13. std.mmfile
    14. std.outbuffer
    15. std.path
    16. std.process
    17. std.random
    18. std.recls
    19. std.regexp
    20. std.socket
    21. std.socketstream
    22. std.stdint
    23. std.stdio
    24. std.stream
    25. std.string
    26. std.system
    27. std.thread
    28. std.uri
    29. std.utf
    30. std.zip
    31. std.zlib
  4. Libraries and Tools
    1. mango
    2. Build
  5. Related Links
  6. About this documentation
Copying
To copy the content of one array to another, you could use a for statement. But D copies arrays better and often faster, if you specify on both target sides which elements you are interested in:

int[20] foo;
int[3] bar;

bar[0..2]  = foo[5..7];

This copies foo[5], foo[6] and foo[7] to bar[0], bar[1] and bar[2].

Note: Do not use more than your variable can handle!
Note: You can not copy overlapping parts:

int[2] foo;
int[5] bar;

foo[0..3] = bar[1..4];    // invalid!!

bar[0..3] = bar[1..4];    // also invalid!

And you can copy all elements at once too:

int[3] bar;
int[3] foo;

bar[]     = foo[];        // copies all elements :-)

See also:
Array Slicing, Array Settings and Operations
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