September 2013
Intermediate to advanced
548 pages
12h 25m
English
Content preview from Programming Erlang, 2nd Edition
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Binaries
Binaries are written and printed as sequences of integers or strings, enclosed in double less-than and greater-than brackets. Here’s an example:
| | 1> <<5,10,20>>. |
| | <<5,10,20>> |
| | 2> <<"hello">>. |
| | <<"hello">> |
| | 3> <<65,66,67>>. |
| | <<"ABC">> |
When you use integers in a binary, each must be in the range
0 to 255. The binary
<<"cat">> is shorthand for
<<99,97,116>>; that is, the binary is made
from the ASCII character codes of the characters in the string.
As with strings, if the content of a binary is a printable string, then the shell will print the binary as a string; otherwise, it will be printed as a sequence of integers.
We can build a binary and extract the elements of a binary using a BIF, or we can use the bit syntax (see ...
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