Anonymous functions use a block of code as a value, defining it as an inline function without a name.
Questions tagged [anonymous-function]
2121 questions
55
votes
14 answers
Choose Python function to call based on a regex
Is it possible to put a function in a data structure, without first giving it a name with def?
# This is the behaviour I want. Prints "hi".
def myprint(msg):
print msg
f_list = [ myprint ]
f_list[0]('hi')
# The word "myprint" is never used…
Tim
- 13,904
- 10
- 69
- 101
55
votes
4 answers
How to pass two anonymous functions as arguments in CoffeScript?
I want to pass two anonymous functions as arguments for jQuery's hover, like so:
$('element').hover(
function() {
// do stuff on mouseover
},
function() {
// do stuff on mouseout
}
);
It's easy with just one – hover -> – but what is…
glortho
- 13,120
- 8
- 49
- 45
53
votes
4 answers
Python: pass statement in lambda form
A Python newbie question, why is this syntax invalid: lambda: pass, while this: def f(): pass is correct?
Thanks for your insight.
Rez
- 615
- 1
- 6
- 9
47
votes
9 answers
Why use anonymous function?
Possible Duplicate:
How do you use anonymous functions in PHP?
Why should i use an anonymous function? I mean, what's the real deal using it?
I just don't really get this. I mean, you use function to make the code more clean or to use it more…
Shoe
- 74,840
- 36
- 166
- 272
46
votes
7 answers
Anonymous recursive function in Scala
Is there a way to write an anonymous function that is recursive in Scala? I'm thinking of something like this:
((t: Tree) => {
print(t.value);
for (c <- t.children)
thisMethod(c)
})(root)
(Related question: Which languages support…
aioobe
- 413,195
- 112
- 811
- 826
46
votes
6 answers
Why and how do you use anonymous functions in PHP?
Anonymous functions are available from PHP 5.3.
Should I use them or avoid them? If so, how?
Edited: just found some nice trick with PHP anonymous functions:
$container = new DependencyInjectionContainer();
$container->mail =…
Kirzilla
- 16,368
- 26
- 84
- 129
44
votes
5 answers
How to execute multiple statements in a MATLAB anonymous function?
I'd like to do something like this:
>> foo = @() functionCall1() functionCall2()
So that when I said:
>> foo()
It would execute functionCall1() and then execute functionCall2(). (I feel that I need something like the C ,…
Daniel LeCheminant
- 50,583
- 16
- 120
- 115
42
votes
2 answers
Difference between function with a name and function without name in Javascript
1.
function abc(){
alert("named function");
}
v/s
2.
function(){
alert("Un-Named function");
}
Kindly explain from beginners point.
Maxx
- 709
- 5
- 11
- 22
41
votes
5 answers
Dollar sign before self declaring anonymous function in JavaScript?
What is the difference between these two:
$(function () {
// do stuff
});
AND
(function () {
// do stuff
})();
xil3
- 16,305
- 8
- 63
- 97
40
votes
3 answers
How can I access local variables from inside a C++11 anonymous function?
I'm doing a simple normalization on a vector (weights), trying to make use of STL algorithms to make the code as clean as possible (I realize this is pretty trivial with for loops):
float tot = std::accumulate(weights.begin(), weights.end(),…
bd1
- 505
- 1
- 5
- 8
39
votes
4 answers
Anonymous functions in WordPress hooks
WordPress hooks can be used in two ways:
using callback function name and appropriate function
add_action( 'action_name', 'callback_function_name' );
function callback_function_name() {
// do something
}
using anonymous function…
Aleksandr Levashov
- 403
- 1
- 4
- 7
38
votes
5 answers
Recursion and anonymous functions in elixir
I'm trying to define an anonymous function to do a dot product, I can code this as a private function without any problem but I am struggling with the anonymous function syntax.
I know I could implement this differently but I am trying to understand…
Batou99
- 869
- 10
- 19
37
votes
4 answers
this value in JavaScript anonymous function
Can anybody explain to me why A is true and B is false? I would have expected B to be true as well.
function MyObject() {
};
MyObject.prototype.test = function () {
console.log("A", this instanceof MyObject);
(function () {
…
Corno
- 5,448
- 4
- 25
- 41
37
votes
4 answers
Can you name the parameters in a Func type?
I have a "dispatch map" defined as such:
private Dictionary, string>> _messageProcessing;
This allows me to dispatch to different methods easily depending on the name of the…
mavnn
- 9,101
- 4
- 34
- 52
36
votes
5 answers
What does this "(function(){});", a function inside brackets, mean in javascript?
Possible Duplicates:
What does this mean? (function (x,y)){…}){a,b); in JavaScript
What do parentheses surrounding a JavaScript object/function/class declaration mean?
Hi All
I don't know what the following does:
(function(){
// Do something…
Shaoz
- 10,573
- 26
- 72
- 100