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+<!DOCTYPE html>
+  <head>
+    <meta charset="utf-8">
+    <meta http-equiv="X-UA-Compatible" content="IE=edge">
+    <title>WebAssembly Example</title>
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+  </head>
+  <body>
+
+
+    <!-- Include the JavaScript glue code. -->
+    <!-- This will load the WebAssembly module and run its main. --> 
+    <script src="index.js"></script>
+    <script type='text/javascript'>
+          var Module = {};
+          fetch('index.wasm')
+            .then(response =>
+              response.arrayBuffer()
+            ).then(buffer => {
+              Module.canvas = document.getElementById("canvas");
+              Module.wasmBinary = buffer;
+              var script = document.createElement('script');
+              script.src = "index.js";
+              script.onload = function() {
+                console.log("Emscripten boilerplate loaded.");
+                run_dft = Module.cwrap("dft",  [],[['float'],['float'],'number','number']);
+                run_fft= Module.cwrap( "fft_1",[],[['float'],['float'],'number','number']);
+
+
+
+                var inputData = document.querySelector('.inputData');
+
+                document.querySelector("#calcButton").onclick = function() {
+                      console.log("calc FFT");
+
+                      function cArray(size) {
+                          var offset = Module._malloc(size * 8);
+                          Module.HEAPF64.set(new Float64Array(size), offset / 8);
+                          return {
+                              "data": Module.HEAPF64.subarray(offset / 8, offset / 8 + size),
+                              "offset": offset
+                          }
+                      }
+
+                      var strArr = inputData.value;
+                      strArr = strArr.replace(/ +(?= )/g,'');
+                      var splArr = strArr.split(" ");
+                      if (splArr.some(i => i != parseFloat(i))) {
+                        throw i + " is not integer"
+                      }
+                      //max size 8 values, as thats enought for a demo
+                      //https://stackoverflow.com/questions/17883799/how-to-handle-passing-returning-array-pointers-to-emscripten-compiled-code
+                      
+                      
+                      myArray = cArray(8).fill(0.0);
+
+                      
+                  }
+
+              } //end onload
+              document.body.appendChild(script);
+            });
+            
+            
+    </script>
+
+    FFT demo
+    <textarea class="inputData">12 12 12</textarea>
+    <button id="calcButton" type="button">Cals</button>
+
+    <script>
+      function calcFFT() {
+              console.log("Calculate FFT")
+              var arrStr = inputData.value;
+              console.log(arrStr)
+            }
+    </script>
+
+  </body>
+</html> 
+\ No newline at end of file