JavaScript: Passing parameters to a callback function

If you want to use a function with parameters as a callback, there are many ways to do it.

Here you are some of them:

Solution 1:

// callback function
function tryMe (param1, param2) { 
    alert (param1 + " and " + param2); 
} 

// callback executer 
function callbackTester (callback) { 
    callback(); 
} 

// test function
callbackTester (function() {
    tryMe("hello", "goodbye"); 
}); 

Solution 2:

function tryMe (param1, param2) {
    alert (param1 + " and " + param2);
}

function callbackTester (callback, param1, param2) {
    callback (param1, param2);
}

callbackTester (tryMe, "hello", "goodbye");

Solution 3:

function tryMe (param1, param2) {
    alert(param1 + " and " + param2);
}

function callbackTester (callback) {
    callback (arguments[1], arguments[2]);
}

callbackTester (tryMe, "hello", "goodbye");

Setting JVM parameters at runtime

For properties you would set via the -D flag on the command line, you want System.setProperty:

// SET

System.setProperty("propname", "hello world");

// GET
String value = System.getProperty("propname");

Enjoy!