Node.js util.types.isBoxedPrimitive() Method

Last Updated : 12 Oct, 2021
The util.types.isBoxedPrimitive() method is an inbuilt application programming interface of util module which is primarily designed to support the needs of Node.js own internal APIs. The util.types.isBoxedPrimitive() method is used to check if the given value is a boxed primitive or not. Syntax: 
util.types.isBoxedPrimitive( value )
Parameters: This function accepts one parameter as mentioned above and described below:
  • value: It is the value that would be checked for a boxed primitive.
Return Value: It returns a boolean value i.e true if the passed value is a boxed primitive otherwise returns false. Below examples illustrate the util.types.isBoxedPrimitive() method in Node.js: Example 1: javascript 
// Node.js program to demonstrate the    
// util.types.isBoxedPrimitive() method

// Import the util module
const util = require('util');

// Checking an unboxed string
let unboxedString = "GeeksforGeeks";
console.log("Value:", unboxedString);
isBoxed = util.types.isBoxedPrimitive(unboxedString);
console.log("Value is a boxed primitive:", isBoxed);

// Checking a boxed string
let boxedString = new String("GeeksforGeeks");
console.log("Value:", boxedString);
isBoxed = util.types.isBoxedPrimitive(boxedString);
console.log("Value is a boxed primitive:", isBoxed);

// Checking an unboxed integer
let unboxedInteger = 99;
console.log("Value:", unboxedInteger);
isBoxed = util.types.isBoxedPrimitive(unboxedInteger);
console.log("Value is a boxed primitive:", isBoxed);

// Checking a boxed integer
let boxedInt = new Number(99);
console.log("Value:", boxedInt);
isBoxed = util.types.isBoxedPrimitive(boxedInt);
console.log("Value is a boxed primitive:", isBoxed);

// Checking an unboxed boolean
let unboxedBool = false;
console.log("Value:", unboxedBool);
isBoxed = util.types.isBoxedPrimitive(unboxedBool);
console.log("Value is a boxed primitive:", isBoxed);

// Checking a boxed boolean
let boxedBool = new Boolean(false);
console.log("Value:", boxedBool);
isBoxed = util.types.isBoxedPrimitive(boxedBool);
console.log("Value is a boxed primitive:", isBoxed);
Output: 
Value: GeeksforGeeks
Value is a boxed primitive: false
Value: [String: 'GeeksforGeeks']
Value is a boxed primitive: true
Value: 99
Value is a boxed primitive: false
Value: [Number: 99]
Value is a boxed primitive: true
Value: false
Value is a boxed primitive: false
Value: [Boolean: false]
Value is a boxed primitive: true
Example 2: javascript 
// Node.js program to demonstrate the    
// util.types.isBoxedPrimitive() method

// Import the util module
const util = require('util');

// Checking for the symbol primitive
let symbol = Symbol('geeks');
console.log("Value:", symbol);
isBoxed = util.types.isBoxedPrimitive(symbol);
console.log("Value is a boxed primitive:", isBoxed);

// Checking again after creating a symbol wrapper
let symbolObj = new Object(Symbol('geeks'));
console.log("Value:", symbolObj);
isBoxed = util.types.isBoxedPrimitive(symbolObj);
console.log("Value is a boxed primitive:", isBoxed);

Value: Symbol(geeks)
Value is a boxed primitive: false
Value: [Symbol: Symbol(geeks)]
Value is a boxed primitive: true
Reference: https://nodejs.org/api/util.html#util_util_types_isboxedprimitive_value
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