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D3.js sequential.copy() Function
  • Last Updated : 31 Aug, 2020

The sequential.copy() function in D3.js is used to construct and return a copy of the original scale. Any changes in original scale will not affect the copy scale and vice-versa. Sequential scales are similar to continuous scales. In a continuous scale, mapping is done in a continuous way between domain and range. The only difference is that the output range of this scale is fixed by its interpolator and this range cannot be changed.

Syntax:

sequential.copy()

Parameters: This function does not accept any parameters.

Return Values: This function returns the copy of the original scale.

Below given are a few examples of sequential.copy() in D3.js:



Example 1:

HTML




<!DOCTYPE html>
<html>
  
<head>
    <script src="https://d3js.org/d3.v6.min.js">
    </script>
</head>
  
<body>
    <h2 style="color:green">
        GeeksforGeeks
    </h2>
  
    <h4> D3.js | sequential.copy() Function </h4>
      
    <script>
        var sequential = d3.scaleSequential();
  
        // Default scale is identity function
        document.write("<h4>From original scale:</h4>")
  
        document.write("<p>sequential(0.2): ", 
                    sequential(0.2) + "</p>");
          
        document.write("<p>sequential(0.5): ", 
                    sequential(0.5) + "</p>");
  
        // Creating copy of the original scale
        var sequentialCopy = sequential.copy();
        document.write("<h4>From copy scale:</h4>")
        document.write("<p>sequentialCopy(0.2): ", 
                    sequentialCopy(0.2) + "</p>");
  
        document.write("<p>sequentialCopy(0.5): ", 
                    sequentialCopy(0.5) + "</p>");
    </script>
</body>
  
</html>

Output:

Example 2: Any change in the copy scale does not affect the original scale.

HTML




<!DOCTYPE html>
<html>
  
<head>
    <script src="https://d3js.org/d3.v6.min.js">
    </script>
</head>
  
<body>
    <h2 style="color:green">
        GeeksforGeeks
    </h2>
  
    <h4> D3.js | sequential.copy() Function </h4>
  
    <script>
        var sequential = d3.scaleSequential();
  
        // Default scale is identity function
        document.write("<h4>From original scale:</h4>");
  
        document.write("<p>sequential(0.4): ", 
                    sequential(0.4) + "</p>");
        document.write("<p>sequential(0.6): ", 
                    sequential(0.6) + "</p>");
  
        // Creating copy of the original scale
        var sequentialCopy = sequential.copy();
        sequentialCopy.domain([1, 2]);
        document.write(
        "<h4>From copy scale after changing domain:</h4>");
  
        document.write("<p>sequentialCopy(0.4): ", 
                    sequentialCopy(0.4) + "</p>");
        document.write("<p>sequentialCopy(0.6): ", 
                    sequentialCopy(0.6) + "</p>");
    </script>
</body>
  
</html>

Output:




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