D3.js threshold.domain() Function

Last Updated : 26 Aug, 2020

The threshold.domain() function is used to set the domain of the threshold scale. The values given in this must be in non-descending order, if not then the behavior of the scale is undefined.

Syntax:

threshold.domain([domain]);

Parameters: This function accepts a single parameter as given above and described below.

domain: This parameter accepts an array of elements in a sorted order which sets the domain of the scale.

Return Value: This function does not return any value.

Below programs illustrate the threshold.domain() function in D3.js

Example 1:

HTML

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8" />
    <meta name="viewport" path1tent=
        "width=device-width,initial-scale=1.0" />

    <script src="https://d3js.org/d3.v4.min.js">
    </script>
</head>

<body>
    <h2 style="color: green;">GeeksforGeeks</h2>

    <p>threshold.domain() Function</p>

    <script>
        var threshold = d3.scaleThreshold()
        
            // Setting domain for the scale.
            .domain([1, 2, 3, 4])
            .range([10, 20, 30, 40, 50]);
        let val1 = threshold(1);
        let val2 = threshold(2);
        let val3 = threshold(4);
        document.write("<h4>" + val1 + "</h4>");
        document.write("<h4>" + val2 + "</h4>");
        document.write("<h4>" + val3 + "</h4>");
    </script>
</body>

</html>

Output:

Example 2:

HTML

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8" />
    <meta name="viewport" path1tent=
        "width=device-width, initial-scale=1.0" />

    <script src="https://d3js.org/d3.v4.min.js">
    </script>
</head>

<body>
    <h2 style="color: green;">GeeksforGeeks</h2>

    <p>threshold.domain() Function </p>

    <script>
        var threshold = d3.scaleThreshold()
        
            // Setting domain for the scale.
            .domain([1, 2, 3, 4]);
        document.write("<h4>" + threshold(0) + "</h4>");
        document.write("<h4>" + threshold(4) + "</h4>");
    </script>
</body>

</html>

Output:

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