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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