The d3.keys() function in D3.js is used to return an array containing the property names or keys of the specified object or an associative array.
Syntax:
d3.keys(object)
Parameters: This function accepts single parameter object containing key and value in pairs.
Return Value: It returns the keys of the given object.
Below programs illustrate the d3.keys() function in D3.js:
Example 1:
<!DOCTYPE html> <html> <head> <title> d3.keys() Function </title> </head> <body> <script> // Initialising an object var month = { "January": 1, "February": 2, "March": 3, "April": 4 }; // Calling the d3.keys() function A = d3.keys(month); // Getting the key values of the given object document.write(A); </script> </body> </html> |
Output:
January, February, March, April
Example 2:
<!DOCTYPE html> <html> <head> <title> d3.keys() Function </title> </head> <body> <script> // Initialising an object var month = { "neveropen": 0, "Geeks": 2, "Geek": 3, "gfg": 4 }; // Calling the d3.keys() function A = d3.keys(month); // Getting the key values of the given object document.write(A); </script> </body> </html> |
Output:
neveropen, Geeks, Geek, gfg
Reference: https://devdocs.io/d3~5/d3-collection#keys
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