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JavaScript handler get() Method

JavaScript handler get() Method with examples on javascript handler, javascript methods, javascript tutorial, apply(), construct(), defineProperty(), deleteProperty(), get(), setPrototypeOf(), set(), ownKeys(), isExtensible() etc.

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JavaScript handler.get() Method

The handler.get method is a trap for getting a property value. This method takes 3 arguments.

Syntax

get: function(target, property, receiver)

Parameters

Target: The target object.

Property: Name of the property to get.

Receiver: The proxy or an object that inherits from the proxy.

Return value

This method can return any value.

Browser Support

Chrome 49
Edge 12
Firefox 18
Opera 36

Example 1

var data = { 
  "a": 11,"b": 21 }
var get = new Proxy(
  data ,  {
  	get: function(y, idx) {
         return y[idx] * 2
         document.writeln("
");
    }  
  }
)

for(var z in get) {
  document.write(z +":")
 document.write(get[z])
}
Test it Now

Output:

a:22b:42

Example 2

var x = { f: 45, g:23 };
var proxy = new Proxy(x, {
  get: function(target, name, proxy) {
    document.write('In get');
     
    var value = target[name];
    if (typeof value === 'string') {
      value = value.toUpperCase();
    }
    return value;
  }
});
document.write (proxy.f);
document.write (x.g);
Test it Now

Output:

In get4523

Example 3

const r = {}
const  p = new Proxy(r, {
  get: function(target, property, receiver) {
   document.write('called: ' + property);
    return 100;
  }
});
document.write(p. a);
Test it Now

Output:

called: a100

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