JavaScript Handler get() Method

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JavaScript handler.get() method in JavaScript is a trap for getting a property value.

Syntax:

const p = new Proxy(target, {
      get: function(target, property, receiver) {
  }
});

Parameters: This method accepts three parameters as mentioned above and described below:

Target: This parameter holds the target object.
Property: This parameter holds the name of the property which is to be get.
Receiver: This parameter holds the proxy or an object that inherits from the proxy.

Return value: This method returns any value.

Below examples illustrate the handler.get() method in JavaScript:

Example 1: In this example, we will set a trap to get the value of the object using the handler.get() method in JavaScript.

javascript

const monster1 = {
    string: 'Geeksforzambiatek',
    num: 334
};
 
const handler1 = {
    get: function (target, prop, receiver) {
        if (prop === 'string') {
            return `${target.string.substr(0, 8)} ... Best portal!`;
        } else {
            return Reflect.get(...arguments);
        }
    }
};
 
const proxy1 = new Proxy(monster1, handler1);
 
console.log(proxy1.num);
console.log(proxy1.string);
console.log(proxy1.numstring);
 
const obj = new Proxy({}, {
    get: function (target, property, receiver) {
        console.log('Property : ' + property);
        return 56.56;
    }
});
 
console.log(obj.value);

Output:

334
"Geeksfor ... Best portal!"
undefined
"Property : value"
56.56

Example 2: In this example, we will set a trap to get the value of the object using the handler.get() method in JavaScript.

javascript

const obj = {};
Object.defineProperty(obj, 'a', {
    configurable: false,
    enumerable: false,
    value: 10,
    writable: false
});
 
const p = new Proxy(obj, {
    get: function (target, property) {
        return 10;
    }
});
 
console.log(p.a);
 
let datalist = {
    "vala": 32, "valb": 7
}
let get = new Proxy(
    datalist, {
    get: function (y, idx) {
        return y[idx] * 11
    }
}
)
 
for (let z in get) {
    console.log(z + " : " + get[z])
}