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Node.js β util.types.isProxy() Method
The util.types.isProxy() method checks whether the passed value is a built-in Proxy instance or not. If the above condition is satisfied, it returns True, else False.
Syntax
util.types.isProxy(value)
Parameters
It takes only one parameter −
value − This input value takes input for the required parameter and checks if it is a Proxy instance or not.
It returns True or False based upon the input value passed.
Example 1
Create a file "isProxy.js" and copy the following code snippet. After creating the file, use the command "node isProxy.js" to run this code.
// util.types.isProxy() Demo Example
// Importing the util module
const util = require('util');
// Defining proxy and target
const target = {};
const proxy = new Proxy(target, {});
// Passing a target as input
console.log("1. " + util.types.isProxy(target));
// Passing a Proxy instance as input
console.log("2. " + util.types.isProxy(proxy));Output
C:\home
ode>> node isFloat32Array.js 1. false 2. true
Example 2
// util.types.isProxy() Demo Example
// Importing the util module
const util = require('util');
// Defining proxy and target
const handler = {
get: function(obj, prop) {
return prop in obj ?
obj[prop] :
37;
}
};
const p = new Proxy({}, handler);
p.a = 1;
p.b = undefined;
console.log(p.a, p.b);
console.log('c' in p, p.c);
// Passing a target as input
console.log("1." + util.types.isProxy(handler));
// Passing a Proxy instance as input
console.log("2." + util.types.isProxy(p));Output
C:\home
ode>> node isInt8Array.js 1 undefined false 37 1.false 2.true
Updated on: 18-Aug-2021
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