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Diffstat (limited to 'system/doc/reference_manual/expressions.xml')
| -rw-r--r-- | system/doc/reference_manual/expressions.xml | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/system/doc/reference_manual/expressions.xml b/system/doc/reference_manual/expressions.xml index 94e40dd077..8c47070890 100644 --- a/system/doc/reference_manual/expressions.xml +++ b/system/doc/reference_manual/expressions.xml @@ -4,7 +4,7 @@ <chapter> <header> <copyright> - <year>2003</year><year>2017</year> + <year>2003</year><year>2018</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> @@ -567,6 +567,10 @@ Expr1 <input>op</input> Expr2</pre> order is defined:</p> <pre> number < atom < reference < fun < port < pid < tuple < map < nil < list < bit string</pre> + <p><c>nil</c> in the previous expression represents the empty list + (<c>[]</c>), which is regarded as a separate type from + <c>list/0</c>. That is why <c>nil < list</c>. + </p> <p>Lists are compared element by element. Tuples are ordered by size, two tuples with the same size are compared element by element.</p> @@ -574,6 +578,7 @@ number < atom < reference < fun < port < pid < tuple < map ascending term order and then by values in key order. In maps key order integers types are considered less than floats types. </p> + <p>Atoms are compared using their string value, codepoint by codepoint.</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 |