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> </head>   <body>     <h2 style="color:green">         neveropen     </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> </head>   <body>     <h2 style="color:green">         neveropen     </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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