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Add clarification on bind / match with = op in erlang. Fixes #1139

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edholland 2015-10-02 02:26:04 +02:00
parent a743c831a0
commit 2e05ec8d95
1 changed files with 6 additions and 3 deletions
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erlang.html.markdown
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@ -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.