JavaScript dataView.getBigInt64() method

Below is the example of the dataView.setInt8() Method.

• Example:

  <script>
     var buffr = new ArrayBuffer(12);
  
     var dataview = new DataView(buffr);
     document.write(dataview.getBigInt64(0));
  </script>
• Output:

  0

This getBigInt64() method is used to get a signed 64-bit integer (long long) at the particular byte offset from the start of the DataView.

Syntax:

dataview.getBigInt64(byteOffset [, littleEndian])

Parameters:

• byteOffset: This parameter specifies the offset, in bytes, from the start of the view to read the data.
• littleEndian: This is optional parameter. If it is true then indicates if the 64-bit int is stored in little- or big-endian format. If set to false or not-defined, then a big-endian value is read.

Return Value: It returns a BigInt value.

Thrown Error: If the byteOffset is passed beyond the end of the view then the RangeError is thrown.

Example 1: In this example, the offset passed is 0, so the value printed is 0 because nothing is set.

<script>
   // Creating buffer with size in byte
   var buffr = new ArrayBuffer(8);

   // Creating a view
   var dataview = new DataView(buffr);
   document.write(dataview.getBigInt64(0));
</script>

Output:

0

Example 2: In this example, the offset passed is 3, so the value printed is 10000 because it is set before.

<script>
    // create an ArrayBuffer with a size in bytes
    const buffr = new ArrayBuffer(16);
    // constant value to set
    const max = 10000n;
    const view = new DataView(buffr);
    view.setBigInt64(3, max);
    document.write(view.getBigInt64(3));
</script>

Output:

10000

Supported Browsers:

• Google Chrome
• Internet Explorer
• Firefox
• Opera