nested-function | 易学教程

JavaScript Nested function

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I got a piece of code for javascript which I just do not understand: function dmy(d) { function pad2(n) { return (n < 10) ? '0' + n : n; } return pad2(d.getUTCDate()) + '/' + pad2(d.getUTCMonth() + 1) + '/' + d.getUTCFullYear(); } function outerFunc(base) { var punc = "!"; //inner function function returnString(ext) { return base + ext + punc; } return returnString; } How can a function be defined within another function? Can we call pad2() from outside of my() function? Please put some light on it. Thanks Functions are another type of variable in JavaScript (with some nuances of course).

Implementation of nested functions

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问题 I recently found out that gcc allows the definition of nested function. In my opinion, this is a cool feature, but I wonder how to implement it. While it is certainly not difficult to implement direct calls of nested functions by passing a context pointer as a hidden argument, gcc also allows to take a pointer to a nested function and pass this pointer to an arbitrary other function that in turn can call the nested function of the context. Because the function that calls the nested function

What are PHP nested functions for?

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问题 In JavaScript nested functions are very useful: closures, private methods and what have you.. What are nested PHP functions for? Does anyone use them and what for? Here\'s a small investigation I did <?php function outer( $msg ) { function inner( $msg ) { echo \'inner: \'.$msg.\' \'; } echo \'outer: \'.$msg.\' \'; inner( $msg ); } inner( \'test1\' ); // Fatal error: Call to undefined function inner() outer( \'test2\' ); // outer: test2 inner: test2 inner( \'test3\' ); // inner: test3 outer( \

Nested Function in Python

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问题 What benefit or implications could we get with Python code like this: class some_class(parent_class): def doOp(self, x, y): def add(x, y): return x + y return add(x, y) I found this in an open-source project, doing something useful inside the nested function, but doing absolutely nothing outside it except calling it. (The actual code can be found here.) Why might someone code it like this? Is there some benefit or side effect for writing the code inside the nested function rather than in the

Javascript call nested function

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问题 I have the following piece of code: function initValidation() { // irrelevant code here function validate(_block){ // code here } } Is there any way I can call the validate() function outside the initValidation() function? I\'ve tried calling validate() but I think it\'s only visible inside the parent function. 回答1: function initValidation() { // irrelevant code here function validate(_block){ console.log( "test", _block ); } initValidation.validate = validate; } initValidation();

JavaScript Nested function

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问题 I got a piece of code for javascript which I just do not understand: function dmy(d) { function pad2(n) { return (n < 10) ? \'0\' + n : n; } return pad2(d.getUTCDate()) + \'/\' + pad2(d.getUTCMonth() + 1) + \'/\' + d.getUTCFullYear(); } function outerFunc(base) { var punc = \"!\"; //inner function function returnString(ext) { return base + ext + punc; } return returnString; } How can a function be defined within another function? Can we call pad2() from outside of my() function? Please put

Why aren't python nested functions called closures?

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问题 I have seen and used nested functions in Python, and they match the definition of a closure. So why are they called nested functions instead of closures ? Are nested functions not closures because they are not used by the external world? UPDATE: I was reading about closures and it got me thinking about this concept with respect to Python. I searched and found the article mentioned by someone in a comment below, but I couldn\'t completely understand the explanation in that article, so that is

Local variables in nested functions

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问题 Okay, bear with me on this, I know it\'s going to look horribly convoluted, but please help me understand what\'s happening. from functools import partial class Cage(object): def __init__(self, animal): self.animal = animal def gotimes(do_the_petting): do_the_petting() def get_petters(): for animal in [\'cow\', \'dog\', \'cat\']: cage = Cage(animal) def pet_function(): print \"Mary pets the \" + cage.animal + \".\" yield (animal, partial(gotimes, pet_function)) funs = list(get_petters()) for