What is DataView.setInt8() in JavaScript?

setInt8() is a method of the DataView object in JavaScript that sets the value of an 8-bit unsigned integer. DataView is used to view and edit data in a binary format. The setInt8() method takes two arguments:

  • the value to set
  • and the position of the value in the data array.

The first argument, the value to set, can be a number between 0 and 255. The second argument, the position of the value in the data array, is optional.

If not specified, the method will set the value at the current position. If specified, the method will set the value at the given position in the data array.

The following code assigns the value 123 to the 8-bit unsigned integer at position 0 in the data array:

var data = new Uint8Array([1,2,3,4,5,6,7,8,9]);
dataView = new DataView(data);
dataView.setInt8(0,123);
console.log(dataView.getInt8(0)); // 123
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