variables

问题 Got a quick question which I hope someone can answer. Basically I have a String variable which needs changing based upon the value in a combo box which has an event listener attached to it. However if I make the string final then it cant be changed, but if i don't make it final then eclipse moans that it isn't final. Whats the best (and simplest) work around? Code is as follows final String dialogOutCome = ""; //create a listener for the combo box Listener selection = new Listener() { public

问题 The following code will output "1." However, shouldn't the keyword "let" not make x a global variable, thus making it invisible to das()? let is supposed to limit the scope of variables to only the block where they're declared, yet here, I'm seeing an inner function have access to a "let" variable, even though x was declared outside its scope. How is that possible? function letTest() { function das () { console.log(x); // How does this function have access to a let variable declared outside

问题 The following code will output "1." However, shouldn't the keyword "let" not make x a global variable, thus making it invisible to das()? let is supposed to limit the scope of variables to only the block where they're declared, yet here, I'm seeing an inner function have access to a "let" variable, even though x was declared outside its scope. How is that possible? function letTest() { function das () { console.log(x); // How does this function have access to a let variable declared outside

问题 I have these two lines that I would like to escape the $type variable: $functionName = str_replace('-', '_', $type); $output .= '<div class="tab-pane" id="'. $type .'">'; I tried escaping like below but its confusing me and not sure whether thats right: $output .= '<div class="tab-pane" id="\'. $type .'\">'; 回答1: Example 1: Variable between single quotes If you use single quotes everything between them will always be treated as part of the string. $output .= '<div class="tab-pane" id="' .

问题 I am working with a dataframe containing two columns with ID numbers. For further research I want to make a sort of dummy variables of these ID numbers (with the two ID numbers). My code, however, does not merge the columns from the two dataframes. How can I merge the columns from the two dataframes and create the dummy variables? Dataframe import pandas as pd import numpy as np d = {'ID1': [1,2,3], 'ID2': [2,3,4]} df = pd.DataFrame(data=d) Current code pd.get_dummies(df, prefix = ['ID1',

问题 I'm storing the arguments to a command in a variable. The final command I want is: mock -r myconfig --define "debug_package %{nil}" --resultdir results --rebuild mypackage.src.rpm Here's my attempt: set -x # for debugging RESULTDIR=results MOCK_CONFIG="myconfig" MOCK_ARGS="-r $MOCK_CONFIG --define \"debug_package %{nil}\" --resultdir $RESULTDIR" cmd="mock $MOCK_ARGS --rebuild mypackage.src.rpm" $cmd The results are: + RESULTDIR=results + MOCK_CONFIG=myconfig + MOCK_ARGS='-r myconfig --define

问题 I'm storing the arguments to a command in a variable. The final command I want is: mock -r myconfig --define "debug_package %{nil}" --resultdir results --rebuild mypackage.src.rpm Here's my attempt: set -x # for debugging RESULTDIR=results MOCK_CONFIG="myconfig" MOCK_ARGS="-r $MOCK_CONFIG --define \"debug_package %{nil}\" --resultdir $RESULTDIR" cmd="mock $MOCK_ARGS --rebuild mypackage.src.rpm" $cmd The results are: + RESULTDIR=results + MOCK_CONFIG=myconfig + MOCK_ARGS='-r myconfig --define

问题 For example I have a variable (public static float currentLife) in script "HealthBarGUI1" and I want to use this variable in another script. How do I pass variable from one script to another C# Unity 2D? 回答1: You could do something like this, because currentLife is more related to the player than to the gui: class Player { private int currentLife = 100; public int CurrentLife { get { return currentLife; } set { currentLife = value; } } } And your HealthBar could access the currentLife in two

问题 Just before I was following a guide to use the MessageBoxA function in assembly, and when creating variables, they used a ", 0" after the variable contents. What is this for? The code looks like this: paramText db "this is text", 0 回答1: db is "define byte" and this code will produce these bytes (in hexadecimal formatting): 74 68 69 73 20 69 73 20 74 65 78 74 00 The "string" in quotes is split into ASCII character codes (UTF8 in NASM is possible too I believe, so then one character may produce

问题 Just before I was following a guide to use the MessageBoxA function in assembly, and when creating variables, they used a ", 0" after the variable contents. What is this for? The code looks like this: paramText db "this is text", 0 回答1: db is "define byte" and this code will produce these bytes (in hexadecimal formatting): 74 68 69 73 20 69 73 20 74 65 78 74 00 The "string" in quotes is split into ASCII character codes (UTF8 in NASM is possible too I believe, so then one character may produce