D3.js | d3.keys() Function

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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> 
      
    <script src = "https://d3js.org/d3.v4.min.js"></script> 
</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> 
      
    <script src = "https://d3js.org/d3.v4.min.js"></script> 
</head> 
  
<body> 
    <script> 
      
        // Initialising an object 
        var month = { 
            "zambiatek": 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:

zambiatek, Geeks, Geek, gfg

Reference: https://devdocs.io/d3~5/d3-collection#keys

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