D3.js | d3.hsl() Function

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The d3.hsl() function in D3.js is used to construct a new HSL color and returns HSL properties of the specified color taken as the parameter of the function.
Syntax:

d3.hsl(h, s, l, opacity)

d3.hsl(color)

Parameters: This function accepts some parameters as mentioned above and described below:

h: It is used to set the hue value.
s: It is used to set the saturation value.
l: It is used to set the lightness value.
opacity: It is used to set the opacity/transparency.
color: It is used to set the color name or hex code.

Return Value: This function returns HSL properties of the specified CSS color taken as the parameter of the function.
Below programs illustrate the d3.hsl() function in D3.js:
Example 1:

javascript

<!DOCTYPE html>
<html>
 
 <head>
    <title>
        D3.js | d3.hsl() Function
    </title>
 
    <script src=
        'https://d3js.org/d3.v4.min.js'>
    </script>
</head>
 
<body>
    <script>
         
        // Calling the d3.hsl() function 
        // with some parameters
        var color1 = d3.hsl("red");
        var color2 = d3.hsl("green");
        var color3 = d3.hsl("blue");
     
        // Getting the HSL properties
        console.log(color1);
        console.log(color2);
        console.log(color3);
    </script>
</body>
 
</html>

Output:

{"h":0, "s":1, "l":0.5, "opacity":1}
{"h":120, "s":1, "l":0.25098039215686274, "opacity":1}
{"h":240, "s":1, "l":0.5, "opacity":1}

Example 2:

javascript

<!DOCTYPE html>
<html>
 
 <head>
    <title>
        D3.js | d3.hsl() Function
    </title>
 
    <script src=
        'https://d3js.org/d3.v4.min.js'>
    </script>
</head>
 
<body>
    <script>
         
        // Calling the d3.hsl() function 
        // without any parameters
        var color = d3.hsl();
     
        // Getting the HSL values
        console.log(color);
    </script>
</body>
 
</html>

Output:

{"h":null, "s":null, "l":null, "opacity":1}

Ref: https://devdocs.io/d3~5/d3-color#hsl

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