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Returning a boolean from a Bash function
I want to write a bash function that check if a file has certain properties and returns true or false. Then I can use it in my scripts in the "if". But what should I return?
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Is it possible to use 'else' in a list comprehension? [duplicate]
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The syntax a if b else c is a ternary operator in Python that evaluates to a if the condition b is true - otherwise, it evaluates to c. It can be used in comprehension statements:
>>> [a if a else 2 for a in [0,1,0,3]]
[2, 1, 2,...
Test if number is odd or even
What is the simplest most basic way to find out if a number/variable is odd or even in PHP?
Is it something to do with mod?
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MQTT物联网协议完全实践指南 · App Inventor 2 中文网
...状态处理
when UrsPahoMqttClient1.ConnectionStateChanged(newState) {
if newState = 1 { // 连接成功
CurrentRetry = 0
Label_ConnectionStatus.Text = "已连接 - 在线"
Label_ConnectionStatus.TextColor = "&HFF4CAF50"
subscribeToAllTopics()
startHeartbeat()
} else if newS...
MDI CDockablePane使用总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
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CMFCPopupMenu::SetForceMenuFocus(FALSE);
InitUserToolbars(NULL, uiFirstUserToolBarId, uiLastUserToolBarId);
EnablePaneMenu(TRUE, ID_VIEW_CUSTOMIZE, 0, ID_VIEW_TOOLBAR);
CDockingManager::SetDockingMode(DT_SMART);
EnableAutoHidePanes(CBRS_ALIGN_ANY);
EnableDocking(CBRS_ALIGN_ANY);
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Why can't R's ifelse statements return vectors?
I've found R's ifelse statements to be pretty handy from time to time. For example:
9 Answers
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Count work days between two dates
...ET @StartDate = '2008/10/01'
SET @EndDate = '2008/10/31'
SELECT
(DATEDIFF(dd, @StartDate, @EndDate) + 1)
-(DATEDIFF(wk, @StartDate, @EndDate) * 2)
-(CASE WHEN DATENAME(dw, @StartDate) = 'Sunday' THEN 1 ELSE 0 END)
-(CASE WHEN DATENAME(dw, @EndDate) = 'Saturday' THEN 1 ELSE 0 END)
If you...
What is the most efficient way of finding all the factors of a number in Python?
...st.__add__,
([i, n//i] for i in range(1, int(n**0.5) + 1) if n % i == 0)))
This will return all of the factors, very quickly, of a number n.
Why square root as the upper limit?
sqrt(x) * sqrt(x) = x. So if the two factors are the same, they're both the square root. If you make o...
Check if the number is integer
... was surprised to learn that R doesn't come with a handy function to check if the number is integer.
12 Answers
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How to export all data from table to an insertable sql format?
...es like this generate to a new query editor window and then just do any modifications where needed.
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