function

问题 I am trying to figure out how to call a Promise using ".then" so I can continue performing other functions on the return Promise output. I have confirmed the function being used works as expected, but after watching videos and other SO examples am still having a hard time getting this working. See below snippet: const fs = require('fs'); const JSZip = require('jszip'); const directoryFile = fs.readdirSync('./zipped'); //console.log(directoryFile); var zip = new JSZip(); var dir = ('./zipped/'

问题 This question already has answers here : Can a local variable's memory be accessed outside its scope? (20 answers) Closed 5 years ago . There's a PDF I'm reading which says that a pointer is invalid after it passes out of scope. See slide #14 in the file below: http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-087-practical-programming-in-c-january-iap-2010/lecture-notes/MIT6_087IAP10_lec05.pdf Now I wrote almost the exact same code below in C++ with Dev-C++ compiler:

问题 I've written this code so that it generates 4 random ints ranging from 1-6 and then remove the smallest number and add it to a list that is returned. I was reading around and found that list comprehensions are the more "pythonic" solution instead of these small for range loops. I would like to know how to write this code as a list comprehension and any help would be greatly appreciated. stats = [] for stat in range(6): score = [random.randint(1, 6) for n in range(4)] score.remove(min(score))

问题 I have tried to make functions for turtle to make it extremely easy to draw shapes and the code looks like this import turtle as t def square(): tw = t.Screen() for i in range(4): t.forward(100) t.right(90) tw.exitonclick() def triangle(): tw = t.Screen() for i in range(3): t.forward(100) t.right(120) tw.exitonclick() def star(): tw = t.Screen() for i in range(5): t.forward(150) t.right(144) tw.exitonclick() when i run this code in shell a problem is fonud... >>> square() >>> triangle()

问题 If I remove my function prototype and move the function from the bottom to the top everything works fine and the function can accept either a float or and int as a datatype. Aren't you normally supposed to prototype functions? Also, I am a bit curious as to why the function only works if it is at the top. I am pretty sure it is a scoping issue, but it is going over my head for some reason. #include <iostream> #include <math.h> #include <iomanip> using namespace std; template <class tyler> //

问题 I have set up an attribute for my products for a delivery time. And I am using the following functions to display it on product archives, on single product pages, on Orders and emails notifications: add_action( 'woocommerce_single_product_summary', 'product_attribute_delivery', 27 ); function product_attribute_delivery(){ global $product; $taxonomy = 'pa_delivery'; $value = $product->get_attribute( $taxonomy ); if ( $value && $product->is_in_stock() ) { $label = get_taxonomy( $taxonomy )-

问题 I made a small particles application, but I was testing it and the function at the bottom has to be called "update". I thought the function name, just like variables, was just a name. I thought it didn't matter what it was named, as long as it's the same when you call it. Apparently I was wrong. It will only recognize "update". If I change the function to "move", it will throw an error. Could someone explain why it's like this? import pygame import random pygame.init() win_height=600 win

问题 This question already has answers here : Why does flowing off the end of a non-void function without returning a value not produce a compiler error? (9 answers) What happens when a function that returns an object ends without a return statement (3 answers) Closed 2 years ago . In a test, one of my classmates wrote the following function, to flip a number: int tukor(int n) { int k=0; while(n!=0) { k=k*10+n%10; n=n/10; } n=k; } You will notice a complete lack of any return statements, but when

问题 A completely basic question - and forgive me if it is a duplicate. set.seed(1) df <- data.frame(id=c('a', 'a', 'b', 'b', 'a'), a=sample(1:10, size=5, replace=T), b=sample(1:10, size=5, replace=T), c=sample(1:10, size=5, replace=T)) Then, > df id a b c 1 a 3 9 3 2 a 4 10 2 3 b 6 7 7 4 b 10 7 4 5 a 3 1 8 To return the column name (a, b or c) with the largest value, and if this is in the id variable take the second highest, I use the below function. FUN <- function(r) { top <- names(r[,c('a', 'b

问题 What do the 20 , 0 and 3 mean in the Python function: SPI_SETDESKWALLPAPER=20 ctypes.windll.user32.SystemParametersInfoA(SPI_SETDESKWALLPAPER,0,'imgpath', 3) I'm quite new and haven't found any useful information. Also, can I define how the Wallpaper behaves, like stretch or tile or center? 回答1: The SystemParametersInfoA function is a direct Windows interface. It is a C interface that in this case we are calling from Python. But it is structured the way it is because it was designed to be