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netweaver:nodes:if [2020/10/04 16:11] – external edit 127.0.0.1netweaver:nodes:if [2020/10/04 18:30] (current) – bjmiller
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 +====== Description ======
 +The if node selects a value or path based on the value of its first child-node.  The mode of operation is dependent on how many child-nodes the if node has. In all cases it is the value of the first (leftmost) node that controls the evaluation. 
  
 +^  child-node count  ^  returns  ^
 +|  1  |  0 or 1  |
 +|  2  |  0 or value<sub>2</sub>  |
 +|  3  |  value<sub>2</sub> or value<sub>3</sub>  |
 +|  4  |  value<sub>2</sub> or value<sub>3</sub> or value<sub>4</sub>  |
 +
 +====== Constraints ======
 +  * Minimum number of child-nodes: 1
 +  * Maximum number of child-nodes: 4
 +
 +====== Calculus ======
 +
 +===== General =====
 +The first (leftmost) child-node is evaluated and compared to the child-node's weight((Weight is a node property that has meaning in only some situations.  By default its value is 1, but can be changed to any numeric value.)) to give a meta result.  This meta result then determines how the if node will act.  (see below)
 +
 +^  value<sub>1</sub>  ^  meta result  ^
 +|  ''>''= weight<sub>1</sub>  |  true  |
 +|  ''<'' weight<sub>1</sub> AND ''>'' -weight<sub>1</sub>  |  undetermined  |
 +|  ''<''= -weight<sub>1</sub>  |  false  |
 +|  ERROR  |  ERROR  |
 +
 +===== 1 child-node =====
 +
 +^  value<sub>1</sub>  ^  meta result  ^  returns  ^
 +|  ''>''= weight<sub>1</sub>  |  true  |  1  |
 +|  ''<'' weight<sub>1</sub> AND ''>'' -weight<sub>1</sub>  |  undetermined  |  0  |
 +|  ''<''= -weight<sub>1</sub>  |  false  |  0  |
 +|  ERROR  |  ERROR  |  ERROR  |
 +
 +===== 2 child-nodes =====
 +
 +^  value<sub>1</sub>  ^  meta result  ^  returns  ^
 +|  ''>''= weight<sub>1</sub>  |  true  |  value<sub>2</sub>  |
 +|  ''<'' weight<sub>1</sub> AND ''>'' -weight<sub>1</sub>  |  undetermined  |  0  |
 +|  ''<''= -weight<sub>1</sub>  |  false  |  0  |
 +|  ERROR  |  ERROR  |  ERROR  |
 +
 +===== 3 child-nodes =====
 +
 +^  value<sub>1</sub>  ^  meta result  ^  returns  ^
 +|  ''>''= weight<sub>1</sub>  |  true  |  value<sub>2</sub>  |
 +|  ''<'' weight<sub>1</sub> AND ''>'' -weight<sub>1</sub>  |  undetermined  |  value<sub>3</sub>  |
 +|  ''<''= -weight<sub>1</sub>  |  false  |  value<sub>3</sub>  |
 +|  ERROR  |  ERROR  |  ERROR  |
 +
 +===== 4 child-nodes =====
 +
 +^  value<sub>1</sub>  ^  meta result  ^  returns  ^
 +|  ''>''= weight<sub>1</sub>  |  true  |  value<sub>2</sub>  |
 +|  ''<'' weight<sub>1</sub> AND ''>'' -weight<sub>1</sub>  |  undetermined  |  value<sub>3</sub>  |
 +|  ''<''= -weight<sub>1</sub>  |  false  |  value<sub>4</sub>  |
 +|  ERROR  |  ERROR  |  ERROR  |