JavaScript dataView.setBigInt64() method

This setBigInt64() method is used to store a signed 64-bit integer (long long) value at the particular byte offset from the start of the DataView.

Syntax:

dataview.setBigInt64(byteOffset, val [, littleEndian])

Parameters:

• byteOffset: This parameter specifies the offset, in bytes, from the start of the view to read the data.
• val: This parameter specifies the value to set as a BigInt.
• 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:

This function does not return anything.

Example 1: In this example, the value set is 7 at offset 0.

<script>
    var buffr = new ArrayBuffer(8);
    var dView = new DataView(buffr);
    dView.setBigInt64(0, 7n);
    document.write(dView.getBigInt64(0));
</script>

Output:

7

Example 2: In this example, the value set is 789 at offset 4.

<script>
    // create an ArrayBuffer with a size in bytes
    const buffr = new ArrayBuffer(16);
    // constant value to set
    const val = 789n;
    const dView = new DataView(buffr);
    dView.setBigInt64(4, val);
    document.write(dView.getBigInt64(4));
</script>

Output:

789

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