The nest.entries() function in D3.js is used to generate the nest and is applies a nest operator to every level of hierarchy rather than the outmost layer only.
Syntax:
nest.entries(array)
Parameters: It takes only one parameter given above and described below.
- Array: It is the array of objects.
Return Value: It returns the array of key-value entries.
Below given are a few examples of the above function.
Example 1: When no entries function is used and keys are assigned.
<!DOCTYPE html> <html lang="en"> <head>   <meta charset="UTF-8">   <meta name="viewport"        content="width=device-width,                  initial-scale=1.0">   <title>Document</title> </head> <style> </style> <body>   <!-- Fetching from CDN of D3.js -->  <script type = "text/javascript"   </script>   <script>     // Forming the array of objects     let array=[       {val:"val10", data:"data11"},       {val:"val20", data:"data22"},       {val:"val30", data:"data33"},       {val:"val30", data:"data33"},       {val:"val30", data:"data33"},       {val:"val50", data:"data33"},       {val:"val40", data:"data44"}     ]     let data= d3.nest()                   .key(function(d) { return d.val; })     console.log(data);   </script> </body> </html> |
Output:
Example 2: When entries function is used with the nest.
<!DOCTYPE html> <html lang="en"> <head>   <meta charset="UTF-8">   <meta name="viewport"         content="width=device-width,                        initial-scale=1.0">   <title>Document</title> </head> <style> </style> <body>   <!-- Fetching from CDN of D3.js -->  <script type = "text/javascript"  </script>   <script>     // Forming the array of objects     let array=[       {val:"val10", data:"data11"},       {val:"val20", data:"data22"},       {val:"val30", data:"data33"},       {val:"val30", data:"data33"},       {val:"val30", data:"data33"},       {val:"val50", data:"data33"},       {val:"val40", data:"data44"}     ]     let data= d3.nest()                   .key(function(d) { return d.val; })                   .entries(array)     console.log("Type is: ", typeof array)     console.log(data);   </script> </body> </html> |
Output:
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