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Node.js util.types.isArrayBufferView() Method

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The “util” module provides ‘utility’ functions that are used for debugging purposes. For accessing those functions we need to call them (by ‘require(‘util’)‘).

The util.types.isArrayBufferView() (Added in v10.0.0) method is an inbuilt application programming interface of the util module which is equivalent to the ArrayBuffer.isView() method. It checks whether the value is an instance of one of the typed array objects or whether DataView which is the ArrayBuffer view. If the value passed is typed array objects or DataView i.e, ArrayBuffer then it returns ‘true’ otherwise returns ‘false’.

Syntax:

const util = require('util');
util.types.isArrayBufferView(value);

Parameters: This method accepts a single parameter as mentioned above and described below:

value <any>: It is a required parameter that accepts any variable, Class, Function, Object, JavaScript primitive, or any datatype.

Return Value<Boolean>: It returns a boolean value. If the value passed is typed array objects or DataView i.e, ArrayBuffer then it returns ‘true’ otherwise returns ‘false’.

Example 1: The below example illustrates the use of util.types.isArrayBufferView() method in Node.js.

Filename: index.js 

javascript




// Node.js program to demonstrate the
// util.types.isArrayBufferView() method
 
// Using require to access util module
const util = require('util');
const { types } = require('util');
 
// Passing ArrayBuffer as parameter
console.log("1.>", util.types.isArrayBufferView(new ArrayBuffer()));
// Returns false
 
// Passing Array with argument as parameter
console.log("2.>", util.types.isArrayBufferView([1, "a", "@", "18"]));
// Returns false
 
// Passing Buffer as parameter
console.log("3.>",
    util.types.isArrayBufferView(Buffer.from('hello world')));
// Returns true
 
// Passing Float64Array as parameter
console.log("4.>", util.types.isArrayBufferView(new Float64Array()));
// Returns true
 
// Passing data as parameter
console.log("5.>", util.types.isArrayBufferView([1, 5, 8, 18]));
// Returns false
 
// Passing Array Buffer wrapped in dataView as parameter
console.log("6.>",
    util.types.isArrayBufferView(new DataView(new ArrayBuffer(16))));
// Returns true
 
// Passing Int8Array as parameter
console.log("7.>", util.types.isArrayBufferView(new Int8Array(8)));
// Returns true


Run the index.js file using the following command:

node index.js

Output:

1.> false

2.> false

3.> true

4.> true

5.> false

6.> true

7.> true

Example 2: The below example illustrates the use of util.types.isArrayBufferView() method in Node.js.

Filename: index.js 

javascript




// Node.js program to demonstrate the
// util.types.isArrayBufferView() method
 
// Using require to access util module
const util = require('util');
const { types } = require('util');
 
let value1 = Uint8Array.from([1, 2, 3, 4])
let akash = value1.subarray(0, 2)
let arrayBuffer = akash.buffer;
let geeksforgeeks = new BigUint64Array(465);
 
// Passing converted arrayBuffer as parameter
console.log("1.>", util.types.isArrayBufferView(arrayBuffer));
// Returns false
 
// Passing empty parameter
console.log("2.>", util.types.isArrayBufferView());
// Returns false
 
// Passing Float32Array as parameter
console.log("3.>", util.types.isArrayBufferView(new Float32Array()));
// Returns true
 
// Passing JSON as parameter
console.log("4.>",
    util.types.isArrayBufferView({ name: "satyam", value: "sahai" }));
// Returns false
 
let amit = new Uint8Array(["alfa", 1]);
 
// Converting to Array buffer
let newArrayBuffer = amit.buffer;
 
// Converting and passing array buffer as parameter
console.log("5.>", util.types.isArrayBufferView(newArrayBuffer));
// Returns false
 
// Passing Uint8Array as parameter
console.log("6.>", types.isArrayBufferView(new Uint8Array()));
// Returns true
 
// Passing and converting buffer as parameter
console.log("7.>", types.isArrayBufferView(geeksforgeeks.buffer));
// Returns false
 
let var1 = new ArrayBuffer();
let var2 = new Int16Array();
 
// Calling util.types.isArrayBufferView() method
if (util.types.isArrayBufferView(var1))
    console.log("Yes, the value have ArrayBuffer View.");
else
    console.log("No, provided value do not have ArrayBuffer View.");
 
// Calling util.types.isArrayBufferView() method
if (util.types.isArrayBufferView(var2))
    console.log("Yes, the value have ArrayBuffer View.");
else
    console.log("No, provided value do not have ArrayBuffer View");


Run the index.js file using the following command:

node index.js

Output:

1.> false

2.> false

3.> true

4.> false

5.> false

6.> true

7.> false

No, provided value do not have ArrayBuffer View.

Yes, the value have ArrayBuffer View.

Reference: https://nodejs.org/api/util.html#util_util_types_isarraybufferview_value



Last Updated : 11 Apr, 2023
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