The log.copy() function is used to create and return the exact copy of the original scale. This copy is not a reference to the original scale so any change in the original scale will not affect the copy scale.
Syntax:
log.copy()
Parameters: This function does not accept any parameters.
Return Values: This function returns the exact copy of the original scale.
Below given are a few examples of the function given above.
Example 1:
<!DOCTYPE html> <html lang="en">   <head>     <meta charset="UTF-8" />     <meta name="viewport" path1tent=         "width=device-width, initial-scale=1.0"/>     </script>     <script src=     </script>     <script src=     </script>     <script src=     </script> </head>     <body>     <h2 style="color:green;">         neveropen     </h2>           <p>D3.js log.copy() Function</p>       <script>         var log = d3.scaleLog()             .domain([1, 20])             .range([10, 20, 30, 40, 50, 60]);           // Using log.copy() Function         let logCopy = log.copy();         document.write("<h3>Original scale: "                 + log(1) + "</h3>");           document.write("<h3>Copy scale: "                 + logCopy(1) + "</h3>");     </script> </body>   </html> |
Output:
Example 2:
<!DOCTYPE html> <html lang="en">   <head>     <meta charset="UTF-8" />     <meta name="viewport" path1tent="width=device-width,     initial-scale=1.0" />     </script>     <script src=     </script>     <script src=     </script>     <script src=     </script> </head>   <body>     <h2 style="color:green;">         neveropen     </h2>       <p>D3.js log.copy() Function</p>       <script>         var log = d3.scaleLog()             .domain([1, 20])             .range([10, 20, 30, 40, 50, 60]);           // Using log.copy() Function         let logCopy = log.copy();         document.write("<h3>Original scale: "                     + log(15) + "</h3>");           document.write("<h3>Copy scale: "                     + logCopy(15) + "</h3>");                               log.interpolate(d3.interpolateRound);           document.write("<p>Changes in original "             + "scale does not affect copy scale.</p>");           document.write("<h3>Original scale: "                         + log(15) + "</h3>");           document.write("<h3>Copy scale: "                     + logCopy(15) + "</h3>");     </script> </body>   </html> |
Output:
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