The node.each() function is used to evaluate a function for each node in Breadth First Order. In this, every node is visited exactly one time. This function is called repeatedly for each descendant node.
Syntax:
node.each(function);
Parameters: This function accepts a single parameter as mentioned above and described below:
- function: This takes a function to be called on each node in the BFS order.
Return Values: This function does not return anything.
Example 1:
HTML
<!DOCTYPE html> <html lang = "en"> <head> <meta charset = "UTF-8" /> <meta name = "viewport" path1tent = "width=device-width, initial-scale = 1.0"/> <script src = </script> </head> <body> <script> // Constructing a tree var tree={ name: "rootNode", children: [ { name: "child1" }, { name: "child2", children: [ { name: "grandchild1", children:[ { name: "grand_granchild1_1" }, { name: "grand_granchild1_2" } ] }, { name: "grandchild2", children:[ { name: "grand_granchild2_1" }, { name: "grand_granchild2_2" } ] }, ] } ] }; var obj = d3.hierarchy(tree); const BFS = []; // Function is used obj.each(d => BFS.push( " ".repeat(d.depth) + `${d.depth}: ${d.data.name}` )); BFS.forEach((e)=>{ console.log("level: ",e); }); </script> </body> </html> |
Output:
Example 2:
HTML
<!DOCTYPE html> <html lang = "en"> <head> <meta charset = "UTF-8" /> <meta name = "viewport" path1tent = "width=device-width, initial-scale = 1.0"/> <script src = </script> </head> <body> <script> // Constructing a tree var tree={ // Level zero name: "rootNode", children: [ { // Level one name: "child1" }, { // Level one name: "child2", children: [ { // Level two name: "grandchild1", children:[{ name: "grand_granchild1_1" }, { name: "grand_granchild1_2" }] } ] }, { // Level one name: "child3" }, { // Level one name: "child4" } ] }; var obj = d3.hierarchy(tree); const BFS = []; // Function is used obj.each(d => BFS.push( " ".repeat(d.depth) + `${d.depth}: ${d.data.name}` )); console.log(BFS); </script> </body> </html> |
Output:
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