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How to compare variables to undefined, if I don’t know whether they exist? [duplicate]
...a valid variable, do something here.
}
Note that typeof always returns a string, and doesn't generate an error if the variable doesn't exist at all.
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Binding multiple events to a listener (without JQuery)?
...* @param {DOMElement} element - DOM element to add listeners to
** @param {string} eventNames - space separated list of event names, e.g. 'click change'
** @param {Function} listener - function to attach for each event as a listener
*/
function addListenerMulti(element, eventNames, listener) {
var...
How to load JAR files dynamically at Runtime?
...RL.class};
/**
* Adds a file to the classpath.
* @param s a String pointing to the file
* @throws IOException
*/
public static void addFile(String s) throws IOException {
File f = new File(s);
addFile(f);
}
/**
* Adds a file to the classpath...
ALTER TABLE to add a composite primary key
I have a table called provider . I have three columns called person , place , thing . There can be duplicate persons, duplicate places, and duplicate things, but there can never be a dupicate person-place-thing combination.
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Why would you use Expression rather than Func?
...ore accurately summarized by saying that an expression is to a func what a stringbuilder is to a string. It's not a string/func, but it contains the needed data to create one when asked to do so.
– Flater
Nov 5 '18 at 14:43
...
Chrome: Uncaught SyntaxError: Unexpected end of input
... same error, because I was using JSON.parse(text) and text value was empty string
– A Khudairy
Feb 24 '15 at 16:50
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How do I add a bullet symbol in TextView?
...
This worked for me:
<string name="text_with_bullet">Text with a \u2022</string>
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Need to log asp.net webapi 2 request and response body to a database
...est.Content != null)
{
// log request body
string requestBody = await request.Content.ReadAsStringAsync();
Trace.WriteLine(requestBody);
}
// let other handlers process the request
var result = await base.SendAsync(request, cancella...
How can I read a text file without locking it?
...eamReader(fs))
{
while (!fs.EndOfStream)
{
string line = fs.ReadLine();
// Your code here
}
}
}
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Android basics: running code in the UI thread
...nLooper());
private class TextViewUpdater implements Runnable{
private String txt;
@Override
public void run() {
searchResultTextView.setText(txt);
}
public void setText(String txt){
this.txt = txt;
}
}
It can be used from anywhere like this:
textViewUpdat...