diff options
Diffstat (limited to 'system/doc/reference_manual/expressions.xml')
| -rw-r--r-- | system/doc/reference_manual/expressions.xml | 32 |
1 files changed, 20 insertions, 12 deletions
diff --git a/system/doc/reference_manual/expressions.xml b/system/doc/reference_manual/expressions.xml index 668a51d6bc..e98fcbcbb9 100644 --- a/system/doc/reference_manual/expressions.xml +++ b/system/doc/reference_manual/expressions.xml @@ -245,13 +245,13 @@ lists:keysearch(Name, 1, List)</code> handle(Msg, State) spawn(m, init, [])</code> <p><em>Examples</em> where <c>ExprF</c> is a fun:</p> - <code type="none"> -Fun1 = fun(X) -> X+1 end -Fun1(3) -=> 4 - -fun lists:append/2([1,2], [3,4]) -=> [1,2,3,4]</code> + <pre> +1> <input>Fun1 = fun(X) -> X+1 end,</input> +<input>Fun1(3).</input> +4 +2> <input>fun lists:append/2([1,2], [3,4]).</input> +[1,2,3,4] +3> </pre> <p>Notice that when calling a local function, there is a difference between using the implicitly or fully qualified function name. @@ -568,10 +568,14 @@ Expr1 <input>op</input> Expr2</pre> <p>The arguments can be of different data types. The following order is defined:</p> <pre> -number < atom < reference < fun < port < pid < tuple < list < bit string</pre> +number < atom < reference < fun < port < pid < tuple < map < nil < list < bit string</pre> <p>Lists are compared element by element. Tuples are ordered by size, two tuples with the same size are compared element by element.</p> + <p>Maps are ordered by size, two maps with the same size are compared by keys in + ascending term order and then by values in key order. + In maps key order integers types are considered less than floats types. + </p> <p>When comparing an integer to a float, the term with the lesser precision is converted into the type of the other term, unless the operator is one of <c>=:=</c> or <c>=/=</c>. A float is more precise than @@ -591,7 +595,11 @@ true 2> <input>1=:=1.0.</input> false 3> <input>1 > a.</input> -false</pre> +false +4> <input>#{c => 3} > #{a => 1, b => 2}.</input> +false +4> <input>#{a => 1, b => 2} == #{a => 1.0, b => 2.0}.</input> +true</pre> </section> <section> @@ -996,7 +1004,7 @@ M4 = M3#{a := 2, b := 3}. % 'a' and 'b' was added in `M1` and `M2`.</code> </p> <list> <item><p>A <c>badmatch</c> exception.</p> - <p>This is if it is used in the context of the matching operator + <p>This is if it is used in the context of the match operator as in the example.</p> </item> <item><p>Or resulting in the next clause being tested in function heads and @@ -1077,7 +1085,7 @@ Ei = Value | <p>Used in a bit string construction, <c>Value</c> is an expression that is to evaluate to an integer, float, or bit string. If the expression is not a single literal or variable, it - is to be enclosed in parenthesis.</p> + is to be enclosed in parentheses.</p> <p>Used in a bit string matching, <c>Value</c> must be a variable, or an integer, float, or string.</p> @@ -1311,7 +1319,7 @@ catch Expr</code> {'EXIT',{badarith,[...]}}</pre> <p>Notice that <c>catch</c> has low precedence and catch subexpressions often needs to be enclosed in a block - expression or in parenthesis:</p> + expression or in parentheses:</p> <pre> 3> <input>A = catch 1+2.</input> ** 1: syntax error before: 'catch' ** |