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What is the dataView.getInt32() method in JavaScript?

Umme Ammara

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

The DataView view in JavaScript provides an interface to read and write multiple number types into an ArrayBufferThe ArrayBuffer object is used to represent a generic, fixed-length, raw binary data buffer..

JavaScript’s dataView.getInt32() is a built-in method in dataView. dataView.getInt32() gets a signed 32-bit integer from the start of the dataView number at a specified offset.

Syntax

dataView.getInt32() is declared as shown below:

Parameters

dataview.getInt32() takes the following two parameters:

  • byteOffset - compulsory parameter that represents the offset, in bytes, from the start of the view from where to read the data.

  • littleEndian - optional parameter that indicates if the 32-bit integer should be stored in little or big-endian notation. If littleEndian is True, the value is read in little-endian format. If it is False or not specified, the value is read in big-endian format.

Return value

The dataView.getInt32() method returns a 32-bit signed integer value.

If byteOffset is set such that it would read beyond the end of the view, then a RangeError occurs.

Examples

The example below shows the use of the dataView.getInt32() method in JavaScript when the second parameter is not specified:

//Create ArrayBuffer
var buf = new ArrayBuffer(16);
//Declare DataView
const dataview = new DataView(buf);
dataview.setInt32(1,1234556789);
//Call getInt32 method
console.log(dataview.getInt32(1));

The example below shows the use of the dataView.getInt32() method in JavaScript when the second parameter is specified:

//Create ArrayBuffer
var buf = new ArrayBuffer(16);
//Declare DataView
const dataview = new DataView(buf);
dataview.setInt32(1,1234556789);
//Call getInt32 method
console.log(dataview.getInt32(1, littleEndian = true));

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Umme Ammara
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Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

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