JavaScript | dataView.setFloat64()

The dataView.setFloat64() is an inbuilt function in dataView which is used to store a signed 64-bit float value at the specified location i.e, at byte offset from the start of the dataView.
Syntax:

dataView.setFloat64(byteOffset)

Parameters: It has parameter byteOffset which is offset in byte i.e. from the start of the view where to read the data.
Return value: This function does not return anything.
JavaScript code to show the working of this method:
Example 1:

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<script>
  
   // Creating buffer with size in byte
   var buffer = new ArrayBuffer(20);
  
   // Creating a view
   var dataview1 = new DataView(buffer, 0, 10);
  
   // put the data 56.24 at slot 1
   dataview1.setFloat64(1, 56.24);
   document.write(dataview1.getFloat64(1));
     
</script>

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Output:

56.24

Example 2:
Below code set the value of PI using Math.PI and gives output as the the value of PI.

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<script>
  
   // Creating buffer with size in byte
   var buffer = new ArrayBuffer(20);
  
   // Creating a view with slot from o to 10
   var dataview1 = new DataView(buffer, 0, 10);
  
   // put the value of PI at slot 1
   dataview1.setFloat64(1, Math.PI);
   document.write(dataview1.getFloat64(1) + "<br>");
     
</script>

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Output:

3.141592653589793

Example 3:
When there is no data to be stored then it gives output as NaN i.e, not a number.

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<script>
  
   // Creating buffer with size in byte
   var buffer = new ArrayBuffer(20);
  
   // Creating a view
   var dataview1 = new DataView(buffer, 0, 10);
  
   // putting no data at slot 1
   dataview1.setFloat64(1);
   document.write(dataview1.getFloat64(1) + "<br>");
     
</script>

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Output:

NaN


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