The d3.scaleThreshold() function in D3.js is used to create and return a new threshold scale that has the specified domain and range. The default value of domain is [0.5] and that of range is [0, 1].
Syntax:
d3.scaleThreshold( domain, range )
Parameters: This function accepts two parameters as given above and described below:
- domain: It defines the minimum and maximum value for the scale. It is an optional parameter. The default value is [0.5].
- range: It accepts a range of discrete values, Every value in domain maps with a value in the range. It is an optional parameter. The default range is [0, 1].
Return Values: This function does not return anything.
Below programs illustrate the d3.scaleThreshold() function in D3.js:
Example 1:
HTML
<!DOCTYPE html> <html>   <head>     </script> </head>   <body>     <h2 style="color: green;">GeekforGeeks</h2>       <p>d3.scaleThreshold() Function </p>       <script>         var threshold = d3.scaleThreshold()               // Setting domain and range for the scale             .domain([10])             .range(["red", "green", "black", "blue"]);           document.write("<h4>" + threshold(9) + "</h4>");         document.write("<h4>" + threshold(10) + "</h4>");     </script> </body>   </html> |
Output:
Example 2:
HTML
<!DOCTYPE html> <html>   <head>     </script> </head>   <body>     <h2 style="color: green;">GeekforGeeks</h2>       <p>d3.scaleThreshold() Function </p>       <script>         var threshold = d3.scaleThreshold()               // Setting domain and range for the scale             .domain([1, 2, 10])             .range([0, 1, 2, 3]);           document.write("<h4>" + threshold(2) + "</h4>");         document.write("<h4>" + threshold(10) + "</h4>");     </script> </body>   </html> |
Output:
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