D3.js arc.cornerRadius() Function

The arc.cornerRadius() function is used to set the corner radius for rounded corners. If the radius is not specified, returns the current corner radius accessor, which defaults to:
function cornerRadius() {
    return 0;
}
Syntax:
arc.cornerRadius([radius]);
Parameters: This function accepts a single parameter as mentioned above and described below.
- radius: This parameter takes a number that decides the radius of the corners.
Return Values: This function returns the arc generator.
Example 1:
HTML
| <!DOCTYPE html>  <htmllang="en">   <head>      <metacharset="UTF-8"/>      <metaname="viewport"          content="width=device-width,                    initial-scale=1.0"/>           <!--Fetching from CDN of D3.js -->    <scriptsrc=      </script>  </head>  <body>      <divstyle="width:300px; height:300px;">         <center>              <h1style="color:green">                 zambiatek             </h1>               <h2>                 arc.cornerRadius()             </h2>          </center>          <svgwidth="300"height="300">         </svg>     </div>      <script>          var svg = d3.select("svg")             .append("g")             .attr("transform", "translate(150,200)");          // An arc generator created         var arc = d3.arc()             .outerRadius(-5)             .innerRadius(150)             .startAngle(0)             // Use of cornerRadius Function             .cornerRadius(6666)             .endAngle(1);          svg.append("path")             .attr("class", "arc")             .attr("d", arc);          let p = document.querySelector(".arc");         p.style.fill="green";     </script>  </body>  </html> | 
Output:
Example 2:
HTML
| <!DOCTYPE html>  <htmllang="en">   <head>      <metacharset="UTF-8"/>      <metaname="viewport"          content="width=device-width,                    initial-scale=1.0"/>        <!--Fetching from CDN of D3.js -->    <scriptsrc=      </script>  </head>  <body>      <divstyle="width:300px; height:300px;">         <center>             <h1style="color:green">                 zambiatek             </h1>               <h2>                 arc.cornerRadius()             </h2>           </center>          <svgwidth="300"height="300">         </svg>     </div>      <script>          var svg = d3.select("svg")             .append("g")             .attr("transform", "translate(120,200)");          // An arc generated         var arc = d3.arc()             .outerRadius(140)             .innerRadius(200)             .startAngle(0)             // Use of cornerRadius Function             .cornerRadius(20)             .endAngle(1);          svg.append("path")             .attr("class", "arc")             .attr("d", arc);          let p = document.querySelector(".arc");         p.style.fill="green";     </script>  </body>   </html> | 
Output:
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