Pass a JavaScript function as parameter

Question

How do I pass a function as a parameter without the function executing in the \"parent\" function or using eval()? (Since I\'ve read that it\'s insecure.)

Answer 1

Example 1:

funct("z", function (x) { return x; });

function funct(a, foo){
    foo(a) // this will return a
}

Example 2:

function foodemo(value){
    return 'hello '+value;
}

function funct(a, foo){
    alert(foo(a));
}

//call funct    
funct('world!',foodemo); //=> 'hello world!'

look at this