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| author | ven <vendethiel@hotmail.fr> | 2015-10-03 18:21:51 +0200 |
|---|---|---|
| committer | ven <vendethiel@hotmail.fr> | 2015-10-03 18:21:51 +0200 |
| commit | 907f4515ca8a80679213d5c0268453fdec3572e1 (patch) | |
| tree | fecef83a8fe613a4bae44c2d09822302db24674d /erlang.html.markdown | |
| parent | 59eaefac54e0551e9c1000e4f5a7fe9edc814993 (diff) | |
| parent | 2e05ec8d955b62fef844bd460f5bb455e351d1d0 (diff) | |
Merge pull request #1280 from edholland/fix-1139
Add clarification on bind / match with = op in erlang. Fixes #1139
Diffstat (limited to 'erlang.html.markdown')
| -rw-r--r-- | erlang.html.markdown | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/erlang.html.markdown b/erlang.html.markdown index 8b67a76a..d0af7f05 100644 --- a/erlang.html.markdown +++ b/erlang.html.markdown @@ -25,6 +25,7 @@ filename: learnerlang.erl %% 1. Variables and pattern matching. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +% In Erlang new variables are bound with an `=` statement. Num = 42. % All variable names must start with an uppercase letter. % Erlang has single-assignment variables; if you try to assign a different @@ -32,9 +33,11 @@ Num = 42. % All variable names must start with an uppercase letter. Num = 43. % ** exception error: no match of right hand side value 43 % In most languages, `=` denotes an assignment statement. In Erlang, however, -% `=` denotes a pattern-matching operation. `Lhs = Rhs` really means this: -% evaluate the right side (`Rhs`), and then match the result against the -% pattern on the left side (`Lhs`). +% `=` denotes a pattern-matching operation. When an empty variable is used on the +% left hand side of the `=` operator to is bound (assigned), but when a bound +% varaible is used on the left hand side the following behaviour is observed. +% `Lhs = Rhs` really means this: evaluate the right side (`Rhs`), and then +% match the result against the pattern on the left side (`Lhs`). Num = 7 * 6. % Floating-point number. |