The Javascript handler set() method creates a collection of unique items.
Syntax:
set: function(target, property, value, receiver)
Parameters:
target: It represents the target object.
property: It represents the name or value of the property.
value: It represents the new of the property.
receiver: It represents the proxy itself.
Return:
Boolean.
Example:
<!DOCTYPE html>
<html>
<body>
<script>
var handler = { foo: 1 };
var d = new Proxy(handler, {
set: function(a,b,c,d) {
document.writeln ('Hello World!');
a[b] = c.toUpperCase();
}});
d.foo = 'Howz U?';
document.writeln(handler.foo);
</script>
</body>
</html>