How can I get the value of var result in this code?
I know this is a basic problem but I'm looking for the solution since 3 days. Can you give me any suggestion please?
function foo(myCallback){
}
function bar() {
var result = foo(function(){
var result = "hello";
return result;
});
}
var showResult = bar();
alert(showResult);
You need to call the callback and return the value of it and inside your bar function, you need to return the result as well
function foo(myCallback){
// return the value of the call myCallback()
return myCallback();
}
function bar(){
var result = foo(function(){
var result = "hello";
return result;
});
// return the result
return result;
}
var showResult = bar();
alert(showResult);A bit simplified it could be
function foo(myCallback){
return myCallback();
}
function bar(){
return foo(function(){
return "hello";
});
}
var showResult = bar();
alert(showResult);
var result declaration with return itself. Actually, in this case, all var result = ...; return result; could be replaced with return ...
You are missing the return statements. It isn't clear what you want to return.
It works like this:
function foo(myCallback){
return myCallback();
}
function bar(){
var result = foo(function(){
var result = "hello";
return result;
});
return result;
}
var showResult = bar();
alert(showResult);
You are stuck using callbacks, but fortunately you can pass parameters in your callback functions:
// define your functions
function foo(myCallback){
myCallback();
}
function bar(callback){
var result = foo(function(){
var result = "hello";
callback(result);
});
}
// now run it
bar(function(showResult){
alert(showResult);
});
callbackfunction foo(myCallback) { } function bar(cb) { foo(function() { var result = "hello"; cb(result); }); } bar(function(res) { alert(res); });